Pregnancy is a unique physiological process that allows parent cells to unite and form a new organism. The development of the fetus over the weeks of pregnancy is an interesting event that many mothers like to remember. Every day and week of pregnancy entails tremendous changes in the fetus and unforgettable impressions on the mother. From this article, expectant mothers will learn a lot of useful and interesting information: when the baby begins to lead an active lifestyle, hear her voice. It is no less interesting to know about changes in the weight of the fetus when the long-awaited ultrasound takes place to determine the sex of the baby.

Intrauterine development of the fetus is divided into two stages:

1. The embryonic period lasts eight weeks after fertilization of the egg. At this time, there is an embryo inside the woman;
2. the fetal period is counted from the ninth week until the moment of birth. At this stage of development, a woman already carries a fetus under her heart.

There is a real due date, which is counted from the moment of fertilization, and an obstetric one, which takes into account the first day of the last menstruation. Their difference is 14 days.

An exciting journey through the weeks of pregnancy

First

An important event occurred - fertilization. The zygote begins its formation. With every day and even hour, the number of embryonic cells increases through fragmentation and on the third day it consists of 8 cells, and on the fourth of 20. They form a small lump that moves to the uterus to begin full development and growth.

Second

The fertilized egg attaches to the wall of the uterus. This process is called implantation, it is a critical moment for the development of the embryo. The mother's body is rebuilt, producing hormones to protect the embryo. There may be pink or brown discharge.

In the same week, the cells of the fertilized egg group:

• the inner layer is responsible for the formation of the lungs, liver, and digestive organs;
• the middle layer forms the bone and circulatory system;
• the outer layer develops the nervous system, skin and hair, etc.

Third

This week precedes the development of the spinal cord and brain, the spine is formed.

At 20-21 days, we can say with confidence that conception was successful. The embryo consists of many cells, and a tiny heart begins to beat - the fetus is ready for intrauterine changes. The appearance of dark discharge signals the threat of miscarriage.

Fourth

The embryo reaches the size of a poppy seed - 1.5 mm. During this period, the laying of the foundations for internal organs begins, the heartbeat increases, the neural tube enters a new phase for the development of the brain, and limbs are born. Extraembryonic organs are formed: the yolk sac, which provides nutrition to the embryo, and the chorion, the future placenta.

Fifth

At this stage, the embryo is no larger than a sesame seed. The placenta, which connects to it through the umbilical cord, is responsible for its nutrition.

• An ultrasound specialist can already determine how many children a woman will have.
• The heart begins to divide into two chambers, changes in the reproductive system and brain appear.
• On an ultrasound, you can see inaccurate facial features, slits for the mouth, and recesses for the eyes and nose.

Sixth

The heart, lungs and bronchial tree are improved. Facial features continue to emerge, and the phalanges of the fingers appear. The uterus enlarges and reaches the size of a plum.

Seventh

This is the time when future parents begin to add to the family album the first photograph of the child's intrauterine development. The heart is already four-chambered and there are 100-190 beats per minute - this is normal. The tail at the base of the spine disappears, the placenta fully supports nutrition and intrauterine processes. There is rapid development of the brain, the middle layer of the adrenal glands, and lymph nodes.

Eighth

The formation of vital organs and tissues is nearing completion. The size of the embryo is only 4 mm, but it already looks like a properly formed organism with protruding fingers, joints, ears, slits for the eyes and mouth. The nervous system is developed, the rudiments of the first teeth are formed.

The embryo begins to move, but this is imperceptible to the expectant mother.

Ninth

The embryo enters the fetal stage. He gained weight up to 2 grams and has a size of 22-30 mm. The cerebellum, the middle layer of the adrenal glands, lymph nodes, mammary glands, and genitals continue to develop over the weeks.

Enormous changes occur: the tiny creature moves its head, swims in the uterus, reacts to the mother’s movements and hears sounds, grabs the umbilical cord, and puts a finger in its mouth. The urinary system begins to work, the sense of smell develops, which will help the newborn find the breast.

Tenth

Weight – 5 g, size 30-40 mm. These days are full of events. The diaphragm is fully formed, the brain is actively developing, ossification of the skull and skeleton occurs, the membranes between the fingers disappear. The liver begins to secrete bile, the intestines contract.

Eleventh

The baby's weight is 8 grams, body length is 5 cm. The formation of blood vessels is nearing completion, the heart is working correctly, the placenta becomes denser and creates excellent protection for the emerging organism. The head is still large, but its transformations occur every day; the liver occupies 10% of the entire body.

Twelfth

The first trimester is at its final stage. The tiny creature has increased significantly and weighs about 9 cm. The rudiments of baby teeth are formed. The digestive system, bones and muscles continue their transformations. The little man is able to smile, sleeps little and has his own taste preferences. The immune system becomes stronger. The belly of the expectant mother is rounded.

Thirteenth

The baby's weight reaches 15-25 grams, height is 10 cm, the heart beats 150 times per minute, and 30 liters of blood are pumped. The cerebral cortex becomes more complex, and the sweat glands come to work. The fetus ingests nutrients and spits out liquid, exercising the lungs. The mouth gap opens periodically.

The bone tissue hardens, the skin becomes multi-layered, but it is still transparent, the eyelids are closed. The placenta independently supplies oxygen and removes waste.

Fourteenth

The intrauterine baby is becoming more and more active. Her weight is 35-45 grams, her height is 11 cm. The skeleton is being formed, the diaphragm is preparing for the first cry, the child has a Rh factor and blood type. The thyroid gland develops, the body prepares to digest proteins and begin to store fat. The intestines produce the first stool, which consists of bile.

The eyes take their assigned place, the facial features take the correct shape. The uterus becomes heavier, its weight is 250 grams.

Fifteenth

The size of the fruit resembles an orange, weighs 70 grams, and height is 13 cm. Most of the body is covered with hair fluff, which retains heat. When the child gains a sufficient amount of fatty tissue, heat exchange will be involved in the process, and then the excess hairs will fall off.

The nails are already formed and lines are being drawn at the fingertips. The child grimaces, the sucking reflex is well developed. The genitals continue to form.

Sixteenth

The baby's height is 14 cm. All components appeared in the blood. The neck is aligned, the liver takes on the function of digestion. The formation of permanent teeth is underway, replacing baby teeth. The skin is still transparent and the blood vessels are visible. The baby moves all parts of the body, which has a positive effect on brain development.

Seventeenth

The man’s height is already more than 15 cm, his weight exceeds the weight of the placenta. The neck has become stronger, and the head now turns 180 degrees. There is an active accumulation of fat on the body, the bronchi are almost fully developed. The child begins to move his eyes. He is already able to protect himself from infections that may come from his mother.

Emotional and mental development is underway, so a pregnant woman is strictly forbidden to experience stress, worry, or be nervous.

Eighteenth

The child's inner ear is formed, the retina of the eye gains sensitivity, the blink reflex appears, but the eyelids are still drooping, and the rudiments of molars are being formed. The baby is responding better to voices, so you don’t need to be shy about talking to your tummy.

Nineteenth

The fruit can be compared to a small zucchini. The length reaches 16-17 cm, and the weight is 300 g. The skin is protected by vernix lubrication from amniotic fluid. There is a leap in development, movements become obvious and correct. The head rotates and maintains its position for a long time. The baby reacts well to factors from the outside world and responds to them with strong blows.

Twentieth

The tiny creature has already reached 20 cm. It begins to show its dissatisfaction with the mother’s incorrect postures or loud sounds, and can distinguish the time of day.

Intervertebral discs appear, a layer of epidermis is formed, movements become more complicated, and the mother feels them perfectly.

Twenty-one

The child gains weight up to 360 grams, reaching a length of 26.5 cm. The digestive system is active, the fetus swallows amniotic fluid, and the spleen begins to function. Bones and muscles are strengthened. Taste receptors are fully formed on the tongue. Boys develop testicles, and girls develop a vagina.

Twenty-second

The baby is gaining more and more weight. Now her weight is 500 grams, and her height is 28 cm. The lungs are fully developed, the brain reaches a weight of 100 grams.

Premature birth at 22 weeks can occur successfully, because modern equipment is available to care for such babies.

Twenty-third

The baby’s weight increases, and the uterus also grows, creating discomfort for the mother. There is a wrinkled appearance of the skin, and fatty tissues grow. Arms and legs lengthen, nails and hair grow.

The boys' genitals move down to the right place. It’s impossible to believe, but such a small creature is capable of dreaming. The number of movements reaches 10 times a day.

Twenty-four

The height of the little man is 30 cm, he may already be hiccupping due to improper ingestion of amniotic fluid or hypoxia, you need to notify the gynecologist about this.

The child often changes position. He no longer has enough space in the placenta and begins to push and push more persistently.

Twenty-fifth

The future family member has a body length of 33 cm and weighs 700 grams. The skin gains density and color. The lungs are training, preparing for the first breath, the brain begins to work with the adrenal glands. Muscles appear.

Weakness and dizziness in the mother mean signs of anemia, you need to see a doctor.

Twenty-sixth

Weight reaches 750 grams, height 35-36 cm. The little creature acquires individual features. The jolts become painful for the mother, and close people can trace the baby’s movements.

The brain produces the necessary hormones, and hearing becomes more refined. The lungs are filled with a special substance that will help them not to stick together at the moment of the first breath and cry.

Twenty-seventh

The weight of the baby increases to one kilogram. The endocrine system begins to produce new functions, the amount of subcutaneous fat returns to normal. The substance that promotes the full expansion of the lungs has been completely developed.

Twenty-eighth

The baby already weighs more than one kilogram and is 38 cm tall. His skin becomes smooth because adipose tissue increases.

The pupillary membrane disappears, allowing the eyes to open. The baby becomes cramped, but this does not affect ontogenesis.

Twenty-ninth

The creature inside the mother weighs 1,300 kg and is 40 cm tall. It is already preparing for birth. The nasal passages are freed from mucus, the amount of vernix lubrication and fluff on the body are reduced. The child receives a sufficient amount of antibodies from the parent’s blood.

Thirtieth

This is the period when the future family member is growing rapidly, thermoregulation is developed, the liver accumulates iron, and the eyes open completely. The child assumes a position for a favorable birth.

Thirty-one

Each week is characterized by an increase in fetal weight of 300-400 grams. At the 31st week of pregnancy, the baby’s weight is 1.5 kg, length – 41 cm. The pancreas reproduces the production of insulin, the liver takes on the job of cleansing the blood of toxins, the brain makes up 1/4 of an adult’s organ.

In boys, the testicles “reach” the scrotum, in girls the clitoris appears.

Thirty-second

The baby is growing, but his skull is still soft, his internal organs are fully functioning. The body produces immunoglobulins, which reproduce the baby’s protection from bacteria and microbes in the first year of life.

Thirty-third

The baby lies down in the fetal position because there is less and less space in the womb. It takes a lot of calcium and iron from the mother’s body.

Thirty-four

The baby is preparing to meet his parents. His weight exceeds 2 kg, height is 47 cm. Active training of the gastrointestinal tract takes place. The woman begins to feel false signs of contractions.

Thirty-fifth

The fruit weighs about 3 kg, the body length reaches 48 cm. The shoulders are rounded, fat appears. The child is at the birth canal and takes the appropriate position.

Thirty-sixth

The head center coordinates the work of thermoregulation, the cardiovascular and respiratory systems. After the birth of the child, they will immediately begin their work. A pregnant woman is worried about shortness of breath.

Thirty-seventh

The baby's weight is 2,950 kg, length is 48-49 cm. Breathing, movements, and heart activity are improved.

Thirty-eighth

The new person has not yet been born, but weighs more than 3 kg, and is already 50 cm tall. All organs are fully developed and function well.

Thirty-ninth

Weight – 3.5 kg, height – 51 cm. The stomach is filled with enzymes that will help the child process food. The little person perfectly senses sounds and light, the sucking reflex is developed.

Fortieth

The family is waiting for a new addition, and it will happen soon. The weight of “little happiness” is 3.5 – 4 kg, height – 51-54 cm.

The stomach drops significantly. The mucus plug and amniotic fluid recede, and contractions begin. After a certain time, the long-awaited baby will be born. Specialists are assessing his condition and monitoring his health for several days.

So the long expedition to study the weekly development of the fetus has come to an end. In order for your pregnancy to be easy and successful, you need to listen to your doctor’s recommendations and monitor your health. There is only joy and happiness ahead.

Film about the development of the fetus in the womb

The appearance of a child in the family- a desired and very exciting moment for which young parents begin to prepare as soon as they learn about pregnancy. Therefore, information regarding fetal development by month of pregnancy is always very important and informative. In addition, the birth of a new life and the development of a little person will also be interesting to people who are not yet thinking about procreation, since nature provides for a simply unique process. It consists of three stages: first, second and third trimesters, during which the formation of the child occurs.

First months of pregnancy- the most important for the further development of the fetus, since right now the fertilized egg attaches to the wall of the uterus and slowly begins to turn into a child.

Whether it will take hold or not, and how correctly the further formation of all the little person’s systems will proceed, depends on a number of factors. Let's try to understand the features of this process week by week.

First week (days 1-7)

We can talk about the beginning of pregnancy when fertilization of a female egg by a male cell (sperm) occurs; they talk about this in biology lessons at school, but what happens next is not studied in detail.

Most often, this process occurs in the fallopian tube (in its ampullary section), but within a couple of hours after the “meeting,” the fertilized egg quickly begins to divide, and then descends through the fallopian tube into the uterine cavity. This entire process takes approximately five days.
As a result, a multicellular organism appears in the uterus, somewhat reminiscent of a blackberry (in Latin “morus”), from which the embryo at this stage received the name “morula”.

On seventh day it penetrates the uterine wall, and the villi of its cells (external) connect with the blood vessels of the female organ, which later form the placenta.

The remaining outer cells become the basis for the development of the membranes of the embryo and its umbilical cord. As for the internal cells, they become the beginning of the internal organs of a small person.

Important! When the egg attaches to the wall of the uterus (implantation), a woman may experience bleeding from the vagina, but this is a completely normal phenomenon and there is no need to worry.

Second week (8-14 days)

The cells of the embryo continue to grow into the mucous membrane of the uterus, after which not only the placenta, but also the umbilical cord and the neural tube begin to form - very important component, from which the nervous system of a new person is subsequently formed.

During this period there should be a complete absence any heavy bleeding, because their presence indicates the possible presence of a disease, for example, endometrial hyperplasia or impaired ovarian function, but a woman may also begin menstruation, which indicates an unsuccessful attempt to become pregnant.

True, it is too early to talk about a full-fledged miscarriage, since the fetus has not yet become one, but for now is only an egg.

Third week (15-21 days)

One of the most difficult and important periods, since right now all the important systems and organs of the unborn child begin to form, the respiratory, circulatory, nervous, digestive and excretory systems are formed, and in the place where the fetal head will soon form, a wide plate appears - the basis for further formation and development of the brain.
Important Feature this week is the beginning of the embryo's heartbeat. Now we can say with confidence that conception has occurred, although the possibility of miscarriage cannot be ruled out.

Did you know? In the third week of pregnancy, the body weight of the unborn baby is only 2-3 mcg, and the length of the “little body” is from 0.15 to 0.2 mm.

Fourth week (22-28 days)

The laying and formation of fetal organs continues, from which the intestines, liver and lungs can be distinguished. The performance of the still tiny heart is increasing more and more.

At the end of the first month During pregnancy, folds of the body are formed in the embryo, and a spine (notochord) is formed, dividing the embryo into two halves with a clear separation of the limbs. On the head of the unborn baby, pits begin to form, which will later become eyes.

Fifth week (29-35 days)

According to the pregnancy calendar, it means the beginning of embryo development in the second month (obstetric).

At that time in a little man (his height from the crown to the coccyx varies between 1.5-2.5 mm), all organs of the digestive (pancreas and liver), respiratory (lungs, larynx, trachea), genital (formation of the precursors of the reproductive organs) begin to take shape cells), nervous (formation of parts of the brain) systems, and also the further development of sensory organs - the eyes and inner ear.

Besides, in the fifth week The umbilical cord is already noticeable and the baby’s limbs continue to form, and the rudiments of marigolds are formed on them. On the front part the nasal cavity and upper lip are already visible.

Many women at this stage clearly feel pregnancy, because the uterus sharply enlarges (outwardly this is not noticeable at all) and puts pressure on the bladder. appear first signs of toxicosis and increased sensitivity to various odors.

Sixth week (36-42 days)

By the sixth week, the unborn baby reaches a length of 4-9 mm. His heart beats very quickly, although it is still far from a full-fledged organ - no atrium. The placenta is being formed, which is just beginning to perform its direct functions, and blood circulation with the embryo has not yet been established.

Continue actively form all parts of the brain, and if you make an encephalogram, you can record the signals sent by the tiny brain. The formation of facial muscles also begins, the eyes of the embryo become more pronounced and are not covered by eyelids.

Upper limbs lengthen slightly, while the lower ones are still in their infancy. In the digestive system, sections of the gastrointestinal tract (small and large intestines, as well as the stomach) begin to form.

The pancreas and liver almost completely complete their formation.

Seventh week (43-49 days)

The length of the embryo body is approximately 10-13 mm. The placenta becomes much thicker, and the baby and mother are already firmly connected by the umbilical cord, through which the uteroplacental circulation is finally formed.

It is noteworthy that the little man still there is a tail, which will soon disappear, and the baby’s legs remain like small fins, while the upper limbs can already bend at the elbows, the rudiments of the fingers begin to be visible. The shoulders and forearms are clearly visible.

Fetal eyes covered with eyelids that protect them from drying out, and the child sometimes opens his mouth slightly. The nose and nasal fold are formed, two paired elevations appear on the sides of the head: from them the auricles then develop.

It was at this time a mucus plug forms, which will close the cervix and protect the baby from harmful environmental factors.

Eighth week (50-56 days)

The baby's body gradually straightens and its length (measured from the tailbone to the crown) corresponds to 20-21 mm (by the end of the week). Continue their formation basic body systems: digestive, cardiovascular, respiratory (especially lungs), urinary and reproductive (in boys, testicles begin to develop).

The sweat and salivary glands are still at the stage of formation. The baby’s face also becomes more familiar to an adult: the eyes are well defined, the nasal cavity and ears are formed, and the process of lip formation is completed.

And the head and all the limbs begin grow rapidly, ossification of the long bones of the legs and arms also occurs. On an ultrasound, you can notice small fingers with no membranes between them. The eighth week is the period of formation of the optic nerve.

The embryo begins to move, but due to its small size, the woman does not feel these movements in any way.

Important! It is in the eighth week that the embryonic stage comes to an end and the embryo is already called a fetus.

Ninth week (57-63 days)

The length of the fruit is in the range of 22-31 mm. The blood vessels of the placenta continue to improve, the system of bones and muscles intensively develops, in particular, the joints of the legs and arms are formed.

Peculiar changes are also noted in the functioning of the cardiovascular system: the heart is already capable of making 150 beats (in 1 minute) and pumping blood through the blood vessels. The brain is still actively growing and developing, the structure of the cerebellum is emerging, and the pituitary gland is being formed.

Also The adrenal glands begin to actively develop, while producing hormones important for the body, lymph nodes develop. At the same time, cranial, spinal and intervertebral nerves appear.

In the unborn child The cartilage tissue also improves, which at this stage is expressed in the design of the auricles, the cartilage of the larynx and the formation of the vocal cords.

At nine weeks the fetus looks like a small pea pod, which through the umbilical cord removes its waste products into the mother’s body.

Tenth week (64-70 days)

The fruit (from crown to tailbone) has already reached a length of 35-40 mm. The most interesting change is the disappearance of the ponytail and the formation of the buttocks, but this, of course, is not the only important change.

Further, the nervous system (already divided into central and peripheral) of the fetus is improved, which can now perform not only chaotic movements, but also shudder in response to a stimulus (the first reflexes are formed).

Eg If the baby accidentally touches the wall of the uterus, he may turn his head, bend or straighten his arms and legs, or even be pushed to the side. At the same time, the development of the diaphragm is coming to an end, which as a result will be directly involved in the breathing process.

With high speed the brain is formed and in one minute up to 250 thousand neurons can be created in it.

Eleventh week (71-77 days)

The body of the unborn child at this time still remains disproportionate: the large head stands out strongly against the background of the small body, and the arms are longer than the legs, bent at all joints and located in a tucked state. By the end of the eleventh week, a fetus measuring 4-5 cm is in the woman’s womb.

At this time, the placenta already fully performs all the functions assigned to it and provides the little person with a sufficient amount of oxygen and micronutrients. In addition, it is she who pushes metabolic products and carbon dioxide out.
The further formation of the baby’s eyes is also noticeable, because the iris appears, which will ultimately determine his eye color.

Appear in the fetal blood first lymphocytes, directly involved in the formation of immunity.

Did you know? At this stage of intrauterine development, the unborn child's liver makes up 10% of his entire body. The intestines also make their first movements (something like peristalsis).

According to experts, at the 11th week the formation of the little person’s sense of smell also occurs.

Twelfth week (78-84 days)

Fruit size(from the crown to the coccyx) approximately within 50-60 mm, its genital organs (male or female) are actively developing and the digestive system is improving. As for the latter, the most noticeable is the lengthening of the intestine and its loop arrangement (exactly like in an adult).

The child is already can swallow amniotic fluid, clench and unclench your fingers, as well as grab your thumb with your mouth and actively suck it. In addition to red blood cells, leukocytes (white blood cells) also appear in the baby’s blood, and single respiratory movements can also be recorded.

Of course, before the moment of birth, the fetus is not yet able to breathe on its own and its lungs do not function properly, but it is quite capable of performing rhythmic movements chest.

Did you know? Starting from the 12th week, unique patterns - fingerprints - are formed on the pads of the tiny person's fingers.

Thirteenth week (85-91 days)

Future baby size reaches approximately 70-75 mm, and the proportions of his body begin to actively change: the lower, upper limbs and torso become longer, and the size of the head does not seem so large.

All these changes the expectant mother can see on the monitor when undergoing an ultrasound scan, especially knowing in advance about the stages of pregnancy and the developmental features of her child week by week.
In addition, week 13 is also significant as the beginning formation of baby teeth, which are located under the lower and upper jaws.

By the way, there are crumbs in the intestines the first villi appear, which after birth will begin to take a direct part in the process of digestion and promotion of food. The pancreas produces the first insulin, and the vocal apparatus is also actively forming.

The baby’s emotional sphere also develops, which learns to respond to sounds, silence, light and shadow, heat and cold, becoming more and more awake.

Fourteenth week (92-98 days)

By the end of the 14th week, the fetal body becomes longer and is already 8-9 cm, and its proportions take on an increasingly familiar appearance. The first hairs are already visible on the head, although they are still quite thin and do not have a specific color.

The surface of the body is covered with sparse vellus hairs.

The bones and muscles of the fetus develop and improve, the first ribs appear, and the development of the bladder, ureters and kidneys, which actively secrete urine that mixes with the amniotic fluid, is completed.
Swallowing amniotic fluid, a child can determine its taste by reacting to sweets with rapid swallowing reflexes or weak sips to bitter ones.

My work begins cells of the pancreas and pituitary gland. In boys, the prostate gland actively develops, and the ovaries of girls are located in the pelvic region.

If you do an ultrasound on quality equipment, then with a high degree of probability it will be possible to find out the gender of your baby.

If we look at the stages of pregnancy in detail by week, then starting from the fifteenth we can talk about the second trimester of pregnancy. Before this time, the fetus has already strengthened in the uterus, all its main systems and organs are almost formed, which reduces the risk of unforeseen situations.
However, quite Expectant mothers should not relax, since there are still many important stages of the baby’s development ahead.

Fifteenth week (99-105 days)

With the beginning second trimester, the fetus weighs approximately 70-75 g, and its length (still measured from the crown to the tailbone) is 10 cm. Despite the fact that the child’s head is large, the growth of his limbs and torso begins to outstrip it.

At the same time, if desired, you can find out the blood type of the little man, and he also begins to excrete original feces (meconium).

However, the most important process in week 15 is the beginning of the formation of the cerebral cortex, which will take place throughout the fourth month.

It is also impossible not to remember activation sweat and sebaceous glands.

Sixteenth week (106-112 days)

At this time, the baby’s body length is about 12 cm, and the weight increases to 100 g. At 112 days after conception, the fetus is considered fully formed, since it already has all the systems and organs.

However, the fetal skin is still quite thin, and subcutaneous fat is almost completely absent, which is why blood vessels are clearly visible. Eyebrows and eyelashes are clearly visible on the face, and nails are partially formed, covering only part of the nail plate.
If we consider the baby With the help of modern ultrasound technologies, you can see how he frowns, breaks into a fleeting smile and makes grimaces. The child is already holding his neck and is able to turn his head, and his ears and eyes are getting closer and closer to their proper place.

Seventeenth week (days 113-119)

Seventeenth week of pregnancy begins with a fetal weight of 120-150 g and a body length of 14-15 cm. The baby’s skin is still as thin, but fatty tissue is intensively formed under it. Baby teeth continue to develop and begin to become covered with dentin.

The reaction to sound stimuli becomes more pronounced and many experts claim that from the beginning of the 17th week the fetus begins to hear (sharp sounds force it to increase activity).
Also the location of the fetus changes: the head rises and takes an almost vertical position, the arms are bent at the elbow, and the fingers are clenched into a fist. The child’s immune system is activated, as a result of which interferon and immunoglobulin are produced in the body. This allows the little man to protect himself from the mother's infections.

At the same time The small heart, vigorously pumping blood, also completes its development. There is also an opinion that the 17th week is critical for the mental development of the baby, therefore both mother and father need to contact him more often, talking affectionately.

Eighteenth week (120-126 days)

At this stage, we can say that the second trimester is approaching the middle. The fruit reached 20 cm in length (from the coccyx to the crown) and gained up to 200 g of weight. His limbs (both upper and lower) are already fully formed, they have phalanges of fingers and even prints.

Continue their development brain and immune system, hearing improves, and a pronounced reaction to light appears. The fat layer is actively formed and even the rudiments of molars are laid.

If this is not the first pregnancy for a woman, then with a high degree of probability she will feel the first movements of his baby. The norm is approximately 10 light tremors per day.

Nineteenth week (127-133 days)

At that time we can talk about a significant leap in fetal development. Movements are more orderly, the respiratory system is improved, and the body is covered with vernix lubrication. The baby's weight reaches 250-300 g, and the length of the fetus varies around 22-23 cm.

At the same time, the size of the head for the first time begins to lag behind the indicators of the torso and limbs, which are actively lengthening.

The pituitary gland, gonads, adrenal glands, pancreas, thyroid and parathyroid glands work intensively. The composition of the blood also changes greatly; in addition to leukocytes and erythrocytes, lymphocytes and monocytes also appear in it.

On this term The baby's kicks are felt not only by the expectant mother, but also by the father if he places his hand on his stomach.

Twentieth week (134-140 days)

The length of the baby's body increases to 25 cm, and the weight is already about 340 g. The skin remains the same thin and covered with vellus hairs, often remaining until birth.

However, subcutaneous fat begins to develop more intensively.
Also at 20 weeks During intrauterine development, the baby develops a blinking reflex, coordination of movements improves and facial expressions become more pronounced.

Having a regular stethoscope, you can calmly listen to the rhythm of his heart, which becomes more stable.

Twenty-first week (days 141-147)

When the fetus reaches 21 weeks of intrauterine development, its growth is measured from the heels, and not from the tailbone, as was previously the case. Now it is approximately 26.7 cm, with the baby weighing about 360-380 g.

Every day subcutaneous adipose tissue is getting bigger, the fetus even develops folds on its body. The digestive system begins to work more actively and the fetus constantly swallows amniotic fluid.

Bone and muscle tissue continue to strengthen, and the spleen also joins the actively working endocrine glands.

Despite his considerable growth, the baby still feels free in the womb of his mother and can occupy almost any position.

Twenty-second week (148-154 days)

Little man size at this stage it increases to 28 cm, and the weight will be in the range of 450-500 g. The head becomes proportional to the body and limbs, and the legs are almost constantly in a bent position.

The child’s spine is characterized by the presence of all ligaments and joints, but the bones continue to strengthen.
The active development of the nervous system is observed: the baby begins to be interested in his face, legs and arms, he brings his fingers to his mouth with interest and tilts his head.

The heart is significant increases in size, since the cardiovascular system is still being improved.

Important! If for some reason the pregnancy is terminated at 22 weeks, modern medical technologies allow such a child to be born, since it is considered fully viable.

Twenty-third week (148-154 days)

In addition to further development of all main systems and organs a small person, who, by the way, at 23 weeks weighs 500 g and has a height of 28 to 30 cm, pigment begins to be synthesized in the skin, giving the skin a bright red color.

Due to the thin subcutaneous fat layer, the fetus appears very thin and strongly wrinkled, and lubricant is mainly concentrated in the folds of the body.
The frequency of respiratory movements increases and is now equal to 50-60 times per 1 minute and the swallowing reflex is still well developed, as a result of which the child swallows part of the amniotic fluid.

Interesting that even such a baby can have hiccups, which a woman feels as rhythmic movements for a couple of minutes.

Moreover, some scientists believe that from this time on, baby can dream, since it was possible to record REM sleep phases in the fetus.

Twenty-fourth week (162-168 days)

The fruit, which was asymmetrical until recently, is increasingly becomes like a child. There is still a little adipose tissue, so the weight gain is not too noticeable and the baby weighs 600 g (height is approximately 32 cm).

It should also be noted that it is at week 24 that the small body begins to independently produce growth hormone, allowing it to grow faster in the future.

The fetus has already taken up almost all the space in the uterine cavity, but can still turn over.
By the end of the sixth month The sense organs have developed well and vision begins to develop (when the abdomen is illuminated with bright light, the baby immediately squints his eyes tightly and turns away).

Completes its development and respiratory system, the bronchial tree and lungs are already fully formed, coated with a special substance - suffracant (prevents the capillary sacs from drying out and closing when inhaling air after birth).

Sweaty and greasy glands are also distinguished by more streamlined work than at previous stages of development, but the main thing for the mother is that it is at this time between her and the future baby an emotional connection is formed: fear, anxiety, melancholy and other negative emotions cause similar feelings in a child.

Twenty-fifth week (169-175 days)

The child grows to 30-34 cm and already weighs 650-700 g. The skin becomes more elastic, there are fewer folds, but it still remains thin and has a large number of capillaries, coloring it reddish.

The front part is even more shaped and the eyes, eyelids, eyelashes, eyebrows, lips, cheeks and ears are already clearly visible.

There is a rapid development of bone marrow - now the main component in hematopoiesis.

Also observed important processes during lung formation: alveoli appear, which before birth are in a “deflated” state (without air), and from the side of the reproductive system, the appearance of the testicles (in boys) or vagina (in girls) is noticeable.

Twenty-sixth week (176-182 days)

The height of the little man at this stage of his development is approximately 36 cm, with a weight of about 750-760 g. Continues to increase muscle mass and fat layer, bones are strengthened and permanent teeth develop further.
In general, the child has already acquired all his personality traits: eyelashes and eyebrows have taken their places, ears have taken shape and now they protrude slightly from the head.

The lungs take their final shape and take their proper place, that is, the child is now completely ready breathe on your own after its birth. The eyes also begin to open, the fetus already recognizes the voices of its parents.

The last stage of pregnancy, which means that you will soon meet your baby and hold him in your arms.

You have already learned how a child grows in the previous 26 weeks, that by this time all the main systems and organs are formed, but the process of its full development during pregnancy is not yet completed, a lot of interesting things await you.

Twenty-seventh week (183-189 days)

At this time The next phase of active growth of a small life begins. The baby's weight is already 850 g with a body length of 37 cm.

All organs of the endocrine and other systems (including the pancreas and thyroid glands, as well as the pituitary gland) are functioning well, and the fetus itself is very active (but can still move freely into the uterine cavity).

At the same time its own metabolism begins to develop. The skin becomes lighter, and underneath it the muscle tissue increases more and more.

Twenty-eighth week (190-196 days)

The baby's weight has reached 950 g, and his length is 38 cm. Fatty tissue continues to accumulate, vellus hair begins to fall out (only on the back and shoulders). Eyebrows, hair on the head and eyelashes acquire a darker color.
The baby opens his eyes much more often, but the cartilages of the ears and nose remain just as soft, and the nails do not reach the edge of the phalanx of the fingers.

Remarkable that it is at this time that one hemisphere of the brain begins to work more actively: if the right hemisphere, the child will be left-handed, and if the left hemisphere will be right-handed.

Twenty-ninth week (197-203 days)

The child is increasingly preparing to enter the big world: The immune system copes with its functions quite well, and the body’s heat regulation also improves its functioning. The baby's weight is now about 1200 g, and his height reaches 39 cm.

Such dimensions significantly reduce the free space in the uterus and all movements of the fetus are expressed in infrequent pushes with arms and legs.
The organs and systems of the small organism continue to improve; for example, up to 500 g of urine is excreted by the kidneys every day.

falls on the cardiovascular system, although the blood circulation of a little person is not yet the same as the blood circulation of a newborn.

With the beginning of the 29th week, the amount of vernix lubrication begins to decrease, and the skin becomes increasingly lighter and smoother.

Thirtieth week (204-210 days)

The child’s weight continues to grow and reaches 1300-1350 g, although the length of the body remains approximately the same - 38-39 cm. Fatty tissue continues its increased accumulation, which increasingly straightens the folds in the skin.

Lack of space in the womb forces the baby to take a certain position: curl up and cross his legs and arms.
Also continue alveoli develop, surfactant is actively produced, that is, the child is preparing to start breathing independently.

Brain development is characterized by the appearance of a large number of convolutions and an increase in the area of ​​the cortex.

Nerve cells function, fibers are formed, around which a protective myelin sheath appears.

The child's liver accumulates iron, thanks to which the baby will be supplied with blood cells throughout the first year of his life.

Thirty-first week (211-217 days)

The baby, who by this time already weighs 1500-1700 g and has a height of 40 cm, has significantly changes in wakefulness and sleep patterns.

Motor activity decreases, although the child kicks well while awake. In addition, these processes are accompanied by the closing or opening of fully formed eyes.

Did you know? At birth, the iris of all children has the same blue color and only after some time begins to change.

The volume of the brain during this period is 25% of the volume of this organ in an adult.

A connection is established between nerve cells, and the nerve fibers continue to be “overgrown” with protective sheaths. Further formation of all organs and systems continues.

Thirty-second week (218-224 days)

If at the previous stages the child has not yet turned upside down, then this usually happens at this stage.

Now the baby weighs approximately 1800 g with a height of 42 cm, and therefore there is less and less space for him. Active accumulation of fatty tissue smoothing the skin.

The internal organs are still improving: the endocrine system secretes hormones, and the lungs accumulate surfactant. In addition, the child begins to produce a special hormone that promotes the appearance of estrogen in the mother’s body, which activates the process of milk production for feeding.

On the head, the baby's hair becomes thicker, but still retains softness.

Thirty-third week (225-231 days)

The lungs are fully formed and in case of early birth at this stage the baby will be able to breathe without assistance. He weighs approximately 2 kg and is 43-44 cm tall.

All parts of the body become more proportional in relation to each other, and systems and organs continue to improve (for example, the mass of the heart increases and the tone of blood vessels increases). The position of the baby's body is fixed in the uterus (he can turn his head or butt down), usually after that he will no longer turn over.

Thirty-fourth week (232-238 days)

The baby’s body weight has already reached 2-2.5 kg, and the body length is at the level of 44-45 cm. Despite the fact that he is practically no different from a newborn, the body is still continuing to improve all its parts.

Cranial bones remain just as soft and mobile, which is necessary for unhindered passage of the birth canal at birth. Increased hair growth begins on the head and it can even change color.
Also worth noting intensive bone strengthening, for which the fetus is forced to take calcium from the mother’s body. Constant swallowing of amniotic fluid by a child stimulates the functioning of the kidneys and gastrointestinal tract.

Thirty-fifth week (239-245 days)

The baby gains 25-35 g daily, which is why the weight can vary significantly and by the end of the week it will be 2200-2700 g (with a height of 46 cm). All internal organs continue to develop, and fatty tissue still accumulates, thanks to which the child becomes well-fed.

There is already a fairly large amount in the fetal intestine meconium, which usually goes away 6-7 hours after birth. The baby is actively training to suck the mother's breast - he sucks fingers (even on his feet) and swallows amniotic fluid.

Thirty-sixth week (246-252 days)

Weight and height The already almost fully formed child is now very different and can range from 2 to 3 kg and from 46 to 48 cm. The adipose tissue is already quite well developed, the skin color acquires a light shade, and wrinkles and folds completely disappear.

Unlike other bones, the cranial bones remain just as soft and have so-called movable "fontanelles". All organs and systems completely ready for his work in the big world.

Thirty-seventh week (254-259 days)

The fruit reaches 48-49 cm in length, and its weight is within 3 kg, with a possible slight deviation from this value. The skin has already brightened well and thickened, and the fat layer increases daily by 14-15 g per day.
The cartilages of the ears and nose become denser and more elastic, maturation ends lungs and digestive system. From this moment on, even if labor begins, it will no longer be considered premature.

Thirty-eighth week (260-266 days)

It is likely that at this stage your baby will be born, but even if this does not happen, then it’s okay if he grows a little more in the womb.

No special processes at 38 weeks already not happening, baby only gaining weight. All his organs and systems are already fully developed and fully functioning.

Thirty-ninth week (267-273 days)

Normally, two weeks before the expected due date, baby starts to go down, increasingly pressing against the bones of the pelvis. It is already fully matured and the placenta begins to gradually age, as a result of which all metabolic processes in it significantly deteriorate.
Baby's weight increases daily by 30-35 g per day, which is accompanied by a complete change in the proportions of his body: the shoulder girdle and chest are already well developed, the tummy is rounded and the limbs have become longer.

Ongoing development of the child's central nervous system, although this process will continue after his birth. During this period, amniotic fluid is renewed every 3 hours, although its total amount is significantly reduced.

Fortieth week (274-280 days)

The fortieth week is considered last stage of pregnancy, but in fact, the child may appear either earlier or later than the due date.
At that time all indicators of its development fully correspond to the characteristics of a newborn baby. Body weight ranges from 2.5 to 4 kg or even higher, and height averages 49-52 cm.

There are intermittent contractions of the uterus, which the woman feels as episodic nagging pain in the lower part. The baby's skull bones are still soft and pliable.
Having gone through all stages of its development, a little man appears in front of you, very similar to his parents, but how he grows up depends only on you.

Before you start counting the term of the expected pregnancy, you need to get acquainted with two concepts - real and obstetric term. The actual gestational age is counted from the moment of fertilization. Obstetric - from the first day of the last menstruation. The difference between them is on average about 2 weeks. The obstetric gestational age is indicated on the sick leave certificate. Therefore, fetal development begins at 3 weeks.

1st week

During this period, fertilization occurred. The fetus is very tiny and it is almost impossible to detect it on an ultrasound. Embryo implantation occurs. The body begins to undergo restructuring and the production of a hormone that is responsible for protecting the fetus during pregnancy. The formation of the placenta and umbilical cord also occurs.

There are no signs of pregnancy in the first week. However, some women already feel drowsiness, weakness, and heaviness in the lower abdomen. The same symptoms occur with premenstrual syndrome. A distinctive feature may be implantation bleeding - small pink or brown discharge.

2nd week

The differences from the first week are minor. In the second week, the fetus increases by 1/10 of its total size. The placenta continues to form and begins to function.

There is a nagging pain in the lower abdomen, and pink discharge may appear. It is important to note that heavy brown discharge may indicate a miscarriage. They are often confused with menstruation.

3rd week

The fetus looks like a small cellular condensation, which can already be detected on ultrasound. Its diameter varies from 0.1 to 0.2 mm, weight - 2-3 μg.

In some women, the urge to urinate becomes more frequent and toxicosis appears. The amount of discharge may sharply increase or decrease. It is important to pay attention to their color and smell. Any deviations from the norm may indicate the presence of an infection.

4th week

The size of the fruit is 5 mm, weight is 0.5 mcg. Externally, the fruit resembles a three-layer disk. Subsequently, each layer (ectoderm, mesoderm, endoderm) will be responsible for the formation of certain organs. Extraembryonic organs develop - chorion, amnion, yolk sac.

The woman's appetite increases noticeably. The belly is slightly rounded, the waist changes shape. The gag reflex increases, and odor intolerance occurs. There is a sharp change in mood, irritability, and emotional instability. The mammary glands gain volume and nipple sensitivity increases.

5th week

The size of the fruit is 4-7 mm, weight - up to 1 gram. The dorsal chord with the neural tube is formed. They then form the center of the nervous system. The organs of the digestive system (liver, pancreas, kidneys, adrenal glands) begin to form. The thyroid gland and heart are formed. Forming blood vessels have already begun to join it.

Nausea worries a woman at any time of the day. The likelihood of miscarriage increases, especially with increased levels of male hormones. An unusual smell and color of discharge, and aching pain in the lower abdomen indicate problems.

6th week

The size of the fruit is 4-9 mm, weight is 0.9-1.3 grams. The fruit begins to move. The fetal nervous system is formed. The brain begins to develop, grooves and convolutions form, and the skull forms. The rudiments of arms and legs appear. The cartilage system develops.

A woman experiences tingling in her chest. There is bloating due to intestinal changes. The rest of the sensations are the same as in previous weeks. Toxicosis continues, and you should be wary if it suddenly stops. Such changes occur when pregnancy fades.

7th week

The size of the fruit is 13 mm, weight is 1.1-1.3 grams. Fingers, neck, ears, and face begin to form. The eyes are still placed far from each other. The heart is fully formed, 2 atria and 2 ventricles have emerged. Red blood cells appear and the Rh factor of the fetus is determined. The fetal intestine grows in length, the appendix and large intestine have formed. The pancreas begins to produce insulin. Bile ducts have formed in the liver. The kidneys and reproductive system develop.

The mother has headaches. Blood pressure may drop, leading to dizziness and fainting. The sensitivity of the nipples increases significantly. They get darker. The breasts are enlarged. Constipation, bloating and heartburn occur. Swelling of the limbs appears.

8th week

The fruit is 14-20 mm in size, weighing 1.5 grams. Many organs have already formed and even begun to function. The heart became four-chambered, vessels and valves formed. Facial features become clearer. Taste buds develop on the tongue.

Sweat and salivary glands are formed, the digestive and excretory systems begin to work. Ovaries are formed in girls and testicles in boys. The diaphragm and bronchial tree begin to form. Joints and muscles, phalanges of the fingers develop. The arms, legs and skull become ossified.

The uterus grows and pain appears in the bladder area. Due to irritation of the sciatic nerve, burning pain occurs in the pelvis and thighs. Eating habits change. The condition of the skin worsens. Varicose veins occur. It is worth considering that nausea during this period should not occur more than 2 times a day.

9th week

The size of the fruit is 22-30 mm, weight is 2 grams. The brain and nervous system are already formed. The cerebellum, pituitary gland, middle layer of the adrenal glands, lymph nodes, mammary glands, and genitals are formed. Cranial, intervertebral and spinal nerves appear. The excretory system is functioning.

The mother's belly becomes rounded, the breasts grow, and varicose veins appear on them. The urge to urinate doubles. Despite the tired state and loss of strength, insomnia appears.

Week 10

The size of the fruit is 3-4 cm, weight is 4-5 grams. The nervous system was formed and divided into central and peripheral. The brain produces neurons and controls all systems of the fetus. The immune and lymphatic systems are formed, and the diaphragm is formed.

Teeth appear. The muscular and skeletal system develops. The arms and legs are fully formed, and the fetus actively moves them. Marigolds began to form on my fingers. Taste and olfactory receptors have developed. The face is fully formed. The fetus opens and closes its mouth.

Toxicosis begins to disappear, but the pain and dizziness do not stop. Appetite increases noticeably. Some women experience constipation and heartburn. A pigmented stripe forms on the abdomen due to the synthesis of melanin.

Week 11

The size of the fruit is 5 cm, weight is 7-8 grams. The placenta is becoming stronger every day. The intestines are temporarily united with the umbilical cord. The brain and nervous system conductivity increases. The sense of smell, genitals, digestive tract, teeth, joints, vocal cords, taste, olfactory and tactile receptors are formed. Reflexes develop, especially sucking and grasping. The fetus begins to react to external stimuli.

The woman feels the baby's movement. Reduces sensitivity to odors, sensitivity and soreness of the breast. The general condition is normalizing.

Week 12

The size of the fruit is 6-9 cm, weight - 14 grams. Thanks to the development of the nervous system, a connection arises between the hemispheres and the spinal cord. All body systems are formed and began to function. The heart supplies them with blood. In addition to erythrocytes, leukocytes were formed in it. The liver began to produce bile, and now the fetus absorbs fats. The sucking reflex develops. Down appears on the head, chin, area above the lip, in place of eyebrows and eyelashes.

The sudden mood swings, nausea, drowsiness, and loss of strength are gone. The urge to go to the toilet becomes less frequent. Skin sensitivity increases and itching occurs.

Week 13

The size of the fruit is 7-10 cm, weight is 15-25 grams. The heart actively pumps blood. The formation of the reproductive system is completed. The baby teeth are completely enclosed. The body develops faster than the head. The skeletal system is being formed. Limbs lengthen. The fingers bend, a prototype of fingerprints appears on them.

The woman is no longer bothered by pregnancy symptoms. The abdomen rounds and begins to protrude. The waist is almost invisible. There is a feeling of tension in the legs, and the risk of varicose veins increases.

Week 14

The size of the fruit is 9-11 cm, weight - 30-40 grams. The chest, diaphragm, intercostal muscles, and muscles develop. The fetus swallows the amniotic fluid and tastes it by sucking its finger. The bridge of the nose and cheeks have formed. The fetus uses facial muscles.

Temporary pain in the groin and sides is normal, provided that they are not cramping in nature. Brittle hair and nails, peeling and dry skin appear. The skin stretches and thins, and stretch marks form. Bleeding gums appear.

Week 15

The size of the fruit is already more than 10 cm, weight - about 70 grams. Blood vessels develop. Blood flows to the organs through the arteries. The skeleton begins to stiffen. The child can bend his elbows and clench his fingers. The face changes. The eyes become closer and take a natural position. The skin is so thin that blood vessels can be seen through it.

Some women feel uplifted, others feel down. Rhinitis, nosebleeds, and night suffocation may occur. The belly increases noticeably compared to week 14.

Week 16

The size of the fruit is 11-13 cm, weight is about 100-120 grams. An ultrasound can determine the sex of the child. The girls have formed a set of eggs. The composition of the blood is fully formed. Nerve cells - neurons - are formed. Nerves intertwine organs. The convolutions and furrows of the brain increase in size. The body becomes proportional, the neck becomes stronger, the fetus holds and turns its head.

The woman is not bothered by frequent urges to go to the toilet. But heartburn and constipation do not go away. Shortness of breath and a feeling of lack of air may occur.

Week 17

The size of the fruit is 13 cm, weight is 140 grams. Ultrasound shows all organs of the fetus. Subcutaneous fat tissue is formed. The bronchi and alveoli developed. Sweat glands, joints, almost the entire muscular system and auditory organ were formed. The muscles contract, so the fetal head straightens.

The woman feels movement. The volume of circulating blood increases, so urination becomes more frequent. Cramps may cramp the calf muscles.

Week 18

The size of the fruit is 14 cm, weight is 190-200 grams. The endocrine and nervous systems develop. Interferon and immunoglobulin are released. The thymus is formed and secretes lymphocytes. The vocal cords and hearing organ are formed. The size of the brain and head increases.

The fetus releases more metabolic products, and this, in turn, affects the emotional state of the mother. Nervousness appears. The woman feels the pressure of the uterus on the abdominal wall and neighboring organs.

Week 19

The size of the fruit is 15.3 cm, weight is about 250 grams. The parts responsible for hearing, vision, taste, smell, and touch are formed in the brain. The connection between the brain and spinal cord and systems is established. The lungs are developing, the bronchial tree is almost formed. The spleen begins to function.

A woman experiences heartburn and bloating, and intestinal motility is impaired due to the displacement of organs by the growing uterus. Sweating increases due to increased activity of the thyroid gland. The belly is large, so it is more difficult to choose a comfortable sleeping position.

Week 20

The size of the fruit is 16 cm, weight is about 300 grams. The organs are formed, but are not ready to function outside the mother’s body. The fetus reacts to light stimuli. He turns and grabs the umbilical cord. Can yawn, frown, smile, hiccup.

The center of gravity shifts due to the growing belly, and the woman’s back begins to hurt. The bandage relieves stress and reduces discomfort. Swelling on the legs, ankles and fingers increases.

21st week

The size of the fruit is 27 cm, weight is about 360 grams. The digestive system is preparing to function outside the mother's body. The fetus sleeps up to 20 hours a day and constantly dreams.

A pregnant woman's belly becomes noticeably larger, and the load on her back and legs increases. The breasts become larger and the areolas become darker. Periodically, dizziness, shortness of breath, and a feeling of lack of air occur.

Week 22

The size of the fruit is 28 cm, weight is about 430 grams. Brain development is completed and neural connections are established. Tactile sensations develop. The child actively reacts to light and sounds, and the woman feels this.

The pain in the back, shoulders, and legs intensifies, which does not go away until the end of pregnancy. It is important to monitor blood pressure and hemoglobin levels to prevent the development of anemia.

Week 23

The size of the fruit is 29 cm, weight is about 500 grams. All systems and organs are functioning, from this moment on, in case of premature birth, the child will survive. The fetus has formed a certain mode of life. A woman can determine what time he is awake and when he is resting. Shoes become too small as the foot lengthens due to the development of flat feet.

Week 24

The size of the fruit is 30 cm, weight - up to 600 grams. The child is actively gaining weight, accumulating adipose tissue, and it becomes crowded in the uterus. Brown fat is deposited mainly on the tummy and in the area between the shoulder blades.

The tremors are felt not only by the mother, but also by the father if he puts his hand to his stomach. Digestion occurs due to compression of the liver and gall bladder by the uterus. During this period, the woman’s skin and hair condition improves.

Week 25

The size of the fruit is 34.5 cm, weight - 660 grams. All parts of the brain are formed, and its weight is 100 grams. The formation of the lungs has been completed. The face is formed. It is determined which hand will become the leading one - the right or left. The fetus is able to distinguish voices and sounds and respond to them. He may press his hands over his ears and push when he hears sharp sounds.

The growing belly puts pressure on the diaphragm. It is harder for a woman to breathe and shortness of breath appears. The amount of discharge (colostrum) from the nipples increases.

Week 26

The size of the fruit is 35.5 cm, weight - 760 grams. The baby's skin smooths out and changes color. The fetal adrenal glands begin to produce growth hormone. The baby periodically pushes against the mother's ribs, which causes pain. The fetus will change position if you lie on its side, stroke its belly, or talk a little. Fatigue and drowsiness increase, and some women experience fainting.

Week 27

The size of the fruit is more than 36 cm, weight reaches 900 grams. The endocrine system is actively developing. The baby is already opening his eyes. Tactile sensations increase, so the fetus feels everything around. A woman feels aching pain in her lower back and muscles. Nausea and weakness appear. The discharge from the genitals should not contain any impurities of blood or pus.

Week 28

The size of the fruit is 38-38.5 cm, weight is about 1 kg. The body prepares for oxygen exchange with the blood. The baby's chest moves rhythmically. The pupillary membrane disappears from the eyeballs, so the child reacts more acutely to light. The belly continues to grow and the pain in the back and legs increases. Nausea may occur due to compression of the digestive organs.

Week 29

The size of the fruit is 38.6 cm, weight is 1150 grams. The fetus's nostrils are freed from mucus plugs, so it smells. The child fixes his gaze on the details that interest him. The fetus accumulates white fat and its body becomes rounded. All organs and systems work as a single organism.

The volume of circulating blood increases, and the woman's pulse increases and her blood pressure decreases. The blood vessels dilate and protruding veins appear on the arms, feet and abdomen.

30th week

The size of the fruit is more than 40 cm, weight is 1.3-1.5 kg. Nerve cells function, nerve fibers are formed. The fetus consciously reacts to stimulation. The formation of the genital organs is nearing completion. The woman’s feelings are the same as in previous weeks. The stomach prevents you from performing many usual actions. Unable to lean forward.

31st week

The size of the fruit is 41 cm, weight is 1.5 kg. Pancreatic cells produce insulin. The liver performs a detoxification function, that is, it filters the blood and removes toxins. The fetal brain is 1/4 of an adult's organ. A corneal reflex appears, which involves closing the eyes when the cornea comes into contact with foreign objects.

A woman's metabolism increases, and therefore sweating increases. Feels dizzy when lying on your back.

Week 32

The size of the fruit is 43 cm, weight is 1.7-1.8 kg. At this stage, the fetus takes the optimal position for childbirth - upside down. The child's skin smoothes out and takes on a natural shade. The growth of the abdomen is accompanied by itching and the appearance of stretch marks. Insomnia is a concern; sleep becomes more restless due to the approaching birth.

Week 33

The size of the fruit is 44 cm, weight is about 2 kg. The immune system is functioning and antibodies are being produced. The body became proportional, rounded, and cheeks appeared on the face. Nails grow on the fingers. The child reacts to light and sounds, feels the mother’s emotions. Therefore, stressful situations should be avoided. A woman may experience itching in the chest and abdomen.

Week 34

The size of the fruit is 45 cm, the weight already slightly exceeds 2 kg. The thyroid gland and adrenal glands produce 10 times more hormones than in an adult. The nails have grown to the end of the nail plate. The hairs on the head have their own pigment. A woman can roughly determine the character of her unborn baby by his activity. The child should move almost every hour if he is awake.

Week 35

The size of the fruit is 46 cm, weight is 2.4 kg. Muscle and fat mass increases. The marigolds have become long, so the fruit can scratch itself. The immune system continues to improve, however, the production of antibodies is not enough to fully protect against infections.

By week 35, fatigue accumulates, especially due to constant lower back pain. The digestive organs have difficulty coping with their task due to increased pressure.

Week 36

The size of the fetus is 47 cm, weight exceeds 2.6 kg. A center has been formed in the brain that coordinates the work of the cardiovascular system, breathing and thermoregulation. Immediately after the baby is born, these systems are ready for use. The fetus continues to develop sucking reflex skills.

The woman feels increasing anxiety and panic. Therefore, nervousness and irritability increase, which prevents proper sleep.

Week 37

The size of the fruit is 48-49 cm, weight is about 2950 grams. In the brain, the control centers for breathing, cardiac activity, and movement are improved. The airways produce surfactant, which will help the baby's lungs open after birth. All muscle groups of the woman are tense. The mother's pain and tension increases towards evening.

38th week

The size of the fruit is 49-50 cm, weight is 3.1 kg. The child’s skeleton becomes stronger every day, only the cranial bones remain soft and are connected by cartilage. After birth, the bones will harden. Eye color is not fully formed due to insufficient pigment. The anxiety of the expectant mother in connection with the upcoming birth is intensifying. Panic worries both in sleep and while awake.

Week 39

The size of the fruit is 50-53 cm, weight - 3250 grams. Original feces (meconium) has formed in the intestines, which will be released after birth. The fetus moves less due to tightness in the womb. It is difficult for the mother to catch the movement.

Possible symptoms of a pregnant woman are a stiff abdomen, increased tone of the uterus, nagging pain in the lower back, and loose stool. In the near future, the mucous plug will be released. It is necessary to monitor these signs of impending labor.

40th week

The size of the fruit is more than 51 cm, weight is about 3.5 kg. The baby turns over and, as a rule, labor occurs this week. The child moves about 10 times a day. The mucus plug falls out and the amniotic fluid drains. Mild nausea and loose stools appear a day before delivery. A woman's weight is maintained or reduced. The abdomen sinks, so the urge to go to the toilet becomes more frequent and incontinence occurs.

In some cases, birth occurs later than 40 weeks. This is often due to incorrect calculation of the deadline.

Forming a new life is a real mystery. This period is happy and at the same time exciting, because a woman will have to face something new. From the moment of conception to the birth of the baby, a whole stage passes, which entails many changes in the body of the expectant mother. To understand what is happening, consider each week of fetal development during pregnancy and the woman’s feelings at this stage.

Articles written

1 Week

In medical practice, it is customary to use obstetric (calendar) and embryonic week-by-week periods of pregnancy development. This is a simple mathematical calculation. The obstetric period is calculated from the beginning of the last menstruation, taking into account the cycle. Fertilization does not always occur at this stage. It can happen in 14-18 days. It depends on the time of ovulation in a woman. You can find out about pregnancy by measuring your basal temperature. Tests and hCG analysis will not show the onset of conception, since in the woman’s body at this time only preparations for a future pregnancy occur.

The pregnancy diary is kept week by week from the conception process. The fusion of sperm and egg occurs in the fallopian tube. After the male and female cells unite, a zygote is formed. It is the basis for the development of the baby, all his organs and systems. At the same time, the first changes begin in the woman’s body. From the 5th-6th day of fertilization, hormonal levels change. The woman begins to produce hCG. The expectant mother's immunity decreases, which is a normal reaction of the body to protect the fetus from rejection.

In the first week, the woman does not feel any serious changes. Therefore, it is difficult to accurately calculate the date of conception. It is extremely rare that an expectant mother may feel signs of toxicosis, a change in taste and smell. Some mothers experience swelling in their breasts, increased nipple sensitivity, and a pulling sensation in the lower abdomen. A woman, as a rule, leads an active lifestyle; there is no drowsiness or change in emotional background yet.

• give up bad habits;
• switch to proper nutrition, give up junk food;
• take any medications or medical procedures only as prescribed by a doctor, informing him of the possible occurrence of conception;
• take vitamins, eat a lot of vegetables and fruits;
• maintain sufficient physical activity;
• often spend time in the fresh air.

A pregnant woman should try not to be nervous; stress has a negative impact on the unborn child. You can read more about the first week.

Starting from the second week, you can already carry out tests and donate blood for hCG. At this stage, in most cases, pregnancy can be confirmed.

2 week

If we take obstetric dates, then the second week of pregnancy is the period of conception. It is at this time that a woman ovulates. The ovary releases a female cell that travels into the fallopian tube. There she waits for fertilization for 24 hours. Male cells - sperm - live longer. They remain active for up to five days. When they meet, conception occurs. If fertilization does not occur, after 2 weeks the unfertilized egg is excreted from the body with menstruation.

From the second week of pregnancy, many girls feel some changes in their bodies. Pregnancy occurs with the following sensations:

• the appearance of sensitivity to various odors. Habitual aromas can become so intense that it greatly irritates the expectant mother;
• mood changes. Emotional “swings” are explained by changes in hormonal levels;
• There may be a pulling, even quite painful feeling in the lower abdomen and back area. This happens due to contraction of the reproductive organ, because the uterus tries to get rid of the endometrium;
• Some women develop increased sexuality during pregnancy. This is due to changes in hormonal levels.

The description of these symptoms does not apply to all women. Sometimes mothers do not feel any changes, especially if it is their first pregnancy. Read more about the second week.

You can find out about the onset of ovulation by measuring basal temperature, using special pharmacy tests, or through a simple calculation if the menstrual cycle is regular.

3 week

It is the third week of pregnancy according to the obstetric period that is considered the time of birth of a small organism. At this stage, a complex process occurs that gives rise to a new life. After the strongest and most active sperm reach the female cell, one of them penetrates the egg. Here a fusion occurs, accompanied by the formation of a set of chromosomes of the unborn child. Surprisingly, the sex of the baby is already determined at this stage. Sperm that do not reach the egg die.

A fertilized female cell is called a zygote. Immediately after fusion, it moves down the fallopian tube into the uterus. During this period, the fertilized egg feeds on various protein compounds. After attachment in the uterus, the long and complex path of fetal development begins. Often at this time a woman may notice slight spotting, but often this symptom goes unnoticed.

Photos of the fetal ultrasound can be found below.

After fertilization, the egg begins to actively divide into blastomeres. At the next stage, the morula is formed. Around the fifth day, a hollow ball is formed, which is called a blastocyst. After it reaches a significant size and the wall ruptures due to stretching, the process of hatching of the embryo from the shell occurs. Immediately after this, the blastocyst attaches to the uterine wall. As a rule, implantation occurs on the seventh day after fertilization.

In the third week, the woman feels some changes. These include:

• drowsiness, weakness, dizziness;
• changes in emotional background, frequent mood swings;
• many mothers experience nausea, changes in taste preferences;
• the breasts become fuller, the shade of the nipples may change (they become darker).

Most young mothers already know about their pregnancy or are beginning to guess about it. During this period, it is very important to take care of your health, because immunity is reduced, a woman is more susceptible to various diseases. For normal development of the embryo, doctors advise getting more rest and eating right. In this case, it is necessary to consume sufficient amounts of vitamins and minerals. It will be useful to take folic acid and other vitamins, for example, Vitrum for pregnant women, Elevit pronatal and others. You can learn more about the development of pregnancy at 3 weeks.

4 week

In the fourth week, the active process of placenta formation begins. In addition, amniotic fluid appears. They are necessary for the normal functioning of the unborn child. During this period, the head and three main layers appear. In the future, all organs and tissues will be formed from these leaves.

At this stage, the embryo consists of the following parts:

• ectoderm (tissue from which the brain is formed);
• endoderm (from which the organs of the digestive system, liver, thyroid gland and pancreas will later form);
• mesoderm (this is the rudiment of the skeleton and circulatory system).

So far, the embryo is very similar to a tadpole and does not have human outlines. Every day the future baby is actively growing and developing.

Mommy's condition remains unstable in the fourth week. A woman often feels mood changes. Drowsiness can be replaced by agitation of consciousness and vice versa. Tastes and smells continue to irritate. For some pregnant women, even ordinary cooking becomes unbearable. Many women suffer from morning sickness and malaise.

The tummy still remains the same, but due to increased appetite, some girls may gain weight. The breasts increase slightly in size. Sometimes the sensitivity and appearance of the nipples increase.

Toxicosis is not observed in all women. Many lucky women are lucky enough to avoid these sensations altogether.

In the fourth week, pregnancy can be easily determined. HCG is already produced in large quantities, so the test will show two lines in 99% of cases.

If a happy event has happened, you should not delay a visit to the gynecologist. At this stage, it will be necessary to pass all tests and undergo an examination in a gynecological chair. This will help to timely identify certain diseases and carry out their treatment. In addition, we must not forget that sometimes it happens. This dangerous condition should be diagnosed and treated as early as possible. Read more about the fourth week.

5 week

In the fifth week, many women who have no idea about pregnancy begin to suspect their delicate situation. There is no menstruation, which most often acts as a signal of conception. In addition to frequent mood swings, there are other changes.

Physiological signs:

• dizziness and fainting. These conditions are explained by a sharp change in blood glucose levels. To avoid such phenomena, a pregnant woman should reconsider her diet, eat in small portions 4-5 times a day;
• increased vaginal discharge. Many mothers notice that the amount of mucus becomes large. This is explained by the process of formation of a plug, which will subsequently protect the fetus from various infections;
• pulling sensations and pain in the lower abdomen may indicate both natural contraction of the uterus and the threat of miscarriage. If you experience such sensations, you should consult your doctor.

In terms of her psycho-emotional state, a woman may experience fear, panic, and excitement. This is quite normal, because now mommy is responsible for her life and for the life of the baby.

In the fifth week of development, the embryo reaches a size of up to 2 cm. Moreover, its body is disproportionate. The head is large, and the body, in comparison, is small. This stage of development is very important. It is now that the neural tube is formed, which will later form the spinal cord.

In the fifth week, it is very important to continue to eat right, get proper rest, and avoid stressful situations. A woman should take vitamins and folic acid. Microelements are necessary for the proper formation of the fetal nervous system. If pregnancy occurs in winter, you should try to be in crowded places as little as possible. The transfer of viral and bacterial diseases during this period can lead to serious consequences, including miscarriage. You can learn more about the fifth week from.

week 6

At this stage, the ultrasound can already see the fetal head, tubercles of the arms and legs. Very soon the fingers will begin to form. Already now the baby’s cheeks, chin, and mouth are emerging. During the sixth week of development, a change in appetite occurs. A woman may feel constant hunger, or, conversely, she may feel sick from any food. This is also associated with weight gain during pregnancy. Some mothers lose weight due to severe toxicosis, while others gain weight. In addition, in some girls the area in the lower abdomen increases slightly. More often this occurs with repeated pregnancies or with decreased uterine tone.

In the picture you can see the embryo at 6 weeks of pregnancy.

A girl should take care of her health and the health of the baby. In addition to proper nutrition, proper rest and hygiene, she should try to avoid contact with various chemicals. This applies even to ordinary household chemicals. A woman is recommended to often walk outside and listen to calm music. All information about the sixth week.

If you notice discharge with a foreign odor or color, you should tell your doctor about it. Such signs may indicate the presence of a fungal infection.

week 7

This period of pregnancy is accompanied by an important event. The corpus luteum is replaced by the placenta. By this time, it should be fully formed and perform well in protecting the fetus. If a woman has suffered from various infectious diseases, the functions of the placenta may be impaired.

The baby is developing quickly. The weight is already 2 grams, and the size is about 2 centimeters. The fetus actively continues to develop its nervous system. The placenta provides the fetus with oxygen and essential nutrients. In addition, it protects against pathogenic microorganisms.

Physiological changes in the child:

• fingers and toes appear;
• bone tissue is formed;
• the embryo is already bending its knees and elbows;
• the heart has 4 chambers, thanks to which blood moves throughout the baby’s body;
• the rudiments of teeth are formed;
• nose and lips appear;
• The genitals are forming, but it is not yet possible to determine the sex of the child.

A young mother, in addition to toxicosis, at this stage may experience swelling, frequent urination, and indigestion. Due to the rapid development of the fetus, a woman often feels a pressing sensation in the lower abdomen. At the seventh week, the uterus reaches the size of a large apple. A dark line begins to appear from the navel to the pubis, and the nipples also darken. Detailed description .

8 week

If we consider pregnancy by month, then 8 weeks is 2 months. At this stage, the woman already clearly understands her condition. External signs of an interesting situation become noticeable:

• the figure is rounded, the gait becomes smoother;
• the condition of the skin changes. It is worth noting that for some ladies it becomes cleaner and smoother. Other girls have to deal with the appearance of acne and age spots;
• the desire to eat something incompatible becomes more and more pronounced.

The first trimester of pregnancy becomes a real test for many mothers. No need to worry. More often, toxicosis disappears by the end of the third month.

The baby's weight is already up to 3 grams. At this stage, almost all systems have already been laid down and continue to be actively formed. The tail, which was present in the coccyx area, disappears, the embryo moves its arms and legs. While these movements are unconscious and chaotic. Every day the bones become stronger. Read more about week 8.

Photo of the fetus on ultrasound

At the eighth week, the fetal visual system is effectively formed. The eyes are located closer to each other, the embryo takes on a human appearance. During an ultrasound examination, you can see the ear canal, facial features are barely noticeable. Surprisingly, during this period the child already reacts to touch.

Week 9

At this stage, the baby continues to grow, moving from embryo to fetus. The head is still large in size, the limbs are well formed. The baby moves freely in the amniotic fluid. Its size does not exceed three centimeters. The genitals are forming, but in the ninth week it is still impossible to determine the sex of the baby.

A woman should also be attentive to her health. If any uncharacteristic discharge appears, you should immediately contact a gynecologist. You also need to pay attention to painful or cramping sensations in the lower abdomen. This often requires consultation with a geneticist and other specialists. Your doctor may order a chorionic villus sampling test to determine possible birth defects. All about the ninth week.

10 week

The woman endures this stage more calmly. Mommy is gradually getting used to her new position, her fears and anxiety are calming down. The baby has already formed the main internal organs and systems, and the brain is actively developing. The baby weighs about 7 grams. The head gradually rises from the chest, becoming more proportional to the body.

In the fetal brain, new chains of neurons are formed every moment. The fingers and toes lengthen, but there is still a partition between them. The internal organs are in their places and continue to improve every day. In boys, testosterone is already beginning to be synthesized, and in girls, the hormone estrogen.

The young mother's mammary glands noticeably enlarge, and veins and capillaries become visible on them. The lower abdomen is rounded. During this period, it is necessary to review your wardrobe and put away tight clothes. Clothing should not restrict the stomach and chest. Due to the rapid growth of the uterus, the girl feels pressure on her internal organs, and urination becomes noticeably more frequent. I have to get up to go to the toilet even at night.

Don't worry about your changing body shape. A woman should enjoy her position and have a positive attitude. Read more about week 10 in this one.

11 week

At this stage of development, the baby already weighs approximately 11 grams, and its size is up to 6 cm. Using ultrasound, it is possible to determine whether the fetus is developing normally. The heart rate is about 140 beats per minute. The third month of pregnancy is accompanied by the formation of the ears and hair follicles. The baby requires more and more nutrients, because its growth is now very rapid.

Most mothers suffering from toxicosis feel relief. By this age, morning sickness and malaise gradually disappear. By the end of the third month, girls literally “bloom.” Feeling better.

If there is no threat of miscarriage, you are allowed to walk a lot and do gymnastics for pregnant women. To prevent the appearance of stretch marks on the body, you can use special creams or natural oils. Olive, almond, apricot and peach oils soften the dermis well. Find out about this deadline.

Nutrition should be complete. The diet should include porridge, soups, lean meat and fish, vegetables, and fruits. It is important to completely avoid caffeinated drinks and alcohol. It is also not recommended to eat large amounts of salty foods. This can lead to swelling. The list of restrictions includes sweet pastries and baked goods in large quantities, and sparkling water.

12 week

It is believed that the risk of miscarriage is highest in the first trimester. At the twelfth week, the expectant mother feels more relaxed, anxiety and fears go away. Often pregnant girls hear that pregnancy suits them. Many ladies really blossom during this period. The hair becomes shiny and thick, the skin is firm, elastic, and more even.

Due to the fact that toxicosis by this time ceases to torment the pregnant woman, many forget about the need for a healthy diet. This is wrong, because healthy food and adherence to a daily routine are the key to the development of a healthy baby.

How much does the fruit weigh? At week 12, the fetus already weighs up to 14 grams. Its height is about 5-6 cm. Further development of the respiratory system occurs here, and the functioning of the digestive system is improved. The baby is already raising his head and taking a finger into his mouth.

In addition, the small organism already responds well to sounds and bright light. Read more.

Week 13

The thirteenth week is the beginning of the second trimester. During this period, doctors recommend that a woman maintain proper nutrition, get plenty of rest, and often be in the fresh air. The tummy becomes more rounded, the waist increases in volume. If a woman is carrying twins or triplets, the belly is quite large. Multiple pregnancies often occur with IVF (artificial insemination). At this stage, mommy should already think about changing her bra. The breasts are quite large, so the usual underwear can squeeze them.

Going to the toilet at the thirteenth week becomes less frequent. This is explained by the raising of the uterus. If painful sensations are detected, you should immediately contact a gynecologist. We must not forget that the threat of miscarriage remains at any time. Vaginal discharge should normally remain without an unpleasant odor or pathological color.

The baby is actively developing inside the mother's womb, its weight is about 20 grams, and its height is up to 7 cm. The small organism reacts to music, touch, bright light, and voices. At this stage, the following physiological changes occur:

• the eyes move more and more towards the bridge of the nose;
• muscles develop, bones become stronger;
• the auricle acquires normal shape;
• the baby has already been sleeping for several minutes;
• the child moves his arms and legs chaotically, but his knees still do not bend.

The size of the fetus is still so small that the woman does not feel its movements. The sex of the child cannot yet be determined. Read about this deadline.

Week 14

Week 19

• weight at 25 weeks is about 700 grams, height is approximately 35 cm;
• strengthening the skeletal system;
• improvement of muscle tissue;
• the baby constantly moves its limbs and turns its head;
• the grasping reflex develops;
• The leading hand is determined - right or left.

Due to the fact that the child’s inner ear is already formed, he orients himself well in space and takes a comfortable body position.

Week 26

With each day of pregnancy, the belly becomes larger, the load on the legs and spine increases. During this period, you should already think about maternity leave. The gait of the expectant mother increasingly resembles a pendulum. The total weight gain ranges from 8-9 kilograms. If increased uterine tone has been diagnosed, the pregnant woman may be placed on preservation.

The baby's height is approximately 35 cm, and his weight is up to one kilogram. Due to the accumulation of subcutaneous fat, the baby becomes lighter and the skin becomes smoother. The little organism is improving every day. The pushes of the arms and legs become more noticeable and even painful for the mother.

During this time, you need to continue to eat right, watch beautiful films, listen to calm classical music. This will help improve the emotional state of mother and baby.

Week 27

It becomes more and more difficult for a woman to do her usual tasks. Difficulties may arise at this stage of pregnancy when putting on shoes, tying shoelaces, and undressing. Many mothers go on maternity leave at this time. This time can be devoted to your favorite activities, hobbies, walks, watching films about the development and upbringing of children.

In the seventh month, changes in the fetus are as follows:

• the formation of such important processes as memory and thinking takes place;
• at this stage the little man’s temperament is formed;
• Bone tissue continues to strengthen, so a woman should not reduce the amount of calcium she consumes;
• further growth of adipose tissue occurs.

In the formation of primary immunity occurs. In the future, it will protect the baby from various diseases.

Many mothers gain quite a lot of weight at this stage of pregnancy. This makes them clumsy and clumsy. In addition, excess body weight provokes drowsiness and fatigue. It is very important to watch your diet, eat a lot of vegetables, herbs, fruits and cereals.

Discomfort in the lumbar region becomes a frequent companion for a young mother. To alleviate them, doctors recommend doing special gymnastics and wearing a bandage.

The following happens during development:

• the baby's layer of subcutaneous fat continues to thicken;
• the rudiments of intelligence appear in the brain, convolutions are formed;
• In response to any irritants, the baby frowns, grimaces, moves his arms, legs, and turns his head.

In case of Rh conflict, the administration of immunoglobulin is necessary. This helps to avoid many serious complications.

Week 29

The child continues to grow, and in the womb he becomes uncomfortable, because there is not enough room for him. The baby's height at 29 weeks of pregnancy reaches approximately 40 cm and weight 1.5 kg. The optic nerves are well developed, which allows the baby to better distinguish light and squint in bright glare. Many mothers feel the baby's hiccups and movements. The organs are well formed, the muscles and respiratory organs are improving.

Most girls are not forced to change their wardrobe, since their tummy no longer fits into their old clothes. Don’t be upset, because you’ll soon be able to get back to normal.

Changes in a pregnant woman:

• the skin becomes drier, pigmentation is noticeable;
• nagging pain is increasingly felt in the back area, the woman gets tired quickly;
• The expectant mother often feels irritated. Due to the fact that she can only lie on her side during sleep, fatigue accumulates.

Despite fatigue and mood swings, mommy should remember the need to continue to eat properly, monitor weight gain, you can keep a personal detailed nutrition diary, and attend routine examinations. Pregnancy management should be carried out by an experienced doctor. If you do not visit the hospital, the outcome can be very negative.

Week 30

- this is seven and a half obstetric months. By this time, the woman gains up to approximately 10 kg, some mothers even more. At this stage, the baby is fully formed and continues to practice breathing. It draws fluid in and out, thereby preparing its lungs to draw in air.

This is where the tiny little man’s active interaction with his mother begins. He gets worried if a woman raises her voice and calms down when she strokes her tummy. The weight of the fetus is approximately 1.5-1.6 kg. He will need to gain about two more kilograms before giving birth. The hairs covering the baby's body begin to gradually disappear, but sometimes they remain for some time after the baby is born.

The grooves in the brain that have formed by this stage of development become deeper. Mommy feels that the baby is not just moving chaotically, but can consciously react to various types of stimuli.

At 30 weeks of pregnancy, the baby is increasingly running out of space. Every now and then he tries to straighten his arms and legs, which the pregnant woman clearly feels.

31 weeks

The fatigue and discomfort of the young mother is increasing more and more. The uterus grows and puts pressure on the internal organs. Back pain occurs while sitting, walking, even lying down becomes uncomfortable. Cramps often occur at night. To alleviate your condition, you should do yoga; a relaxing massage helps a lot. At this stage, doctors recommend reducing the amount of fluid consumed, maintaining a healthy diet, and limiting the amount of salt.

Physiological changes in a child are as follows:

• weight is approximately 1.7 kg;
• height reaches 40-45 cm;
• the baby’s basic senses improve (hearing, vision, smell);
• neural connections are increasingly developing;
• the period of wakefulness becomes longer.

The closer the upcoming birth is, the more the pregnant woman’s anxiety increases. Fears and worries are completely normal feelings, and family and friends should help you cope with them.

Week 32

At this stage of pregnancy, the baby's height is up to 47 cm and weight is approximately 1.8 kg. Many babies are still in a feet-down position, but they soon roll over to the correct position. Coordination of movements improves, the brain develops better. In the last stages of pregnancy, many doctors advise mothers to read books, listen to calm music, and recite poems to the child. It is believed that this helps to improve the development of the baby and make his psyche more stable.

A woman’s feelings at this stage of pregnancy can hardly be called pleasant. The uterus enlarges and puts pressure on the stomach, heart, and diaphragm. It becomes harder to breathe, the woman suffers from belching, heartburn, and it is increasingly difficult to find a comfortable body position.

Many women can feel contractions, but more often they are false. They are called Braxton-Higgs contractions. This is a kind of training before the upcoming birth.

Week 33

The weight gain of a pregnant woman at this stage is approximately 12-14 kg. Due to the fear of the upcoming birth, the irritability of the young mother increases. To avoid various problems, a girl is advised to remain calm, communicate more with loved ones, and watch films about the birth and upbringing of children.

The child often turns head down. If this does not happen, do not be upset. Doctors will help monitor the birth process. The baby is rounded, cheeks and skin folds appear, and the skin brightens.

In the last trimester of pregnancy, the musculoskeletal system is actively developing. A woman should not forget about adequate calcium intake during this period.

34 week

Thoughts about the birth of a baby at this stage of pregnancy become more and more frequent. Meeting the baby is becoming more and more desirable. A girl’s body weight, as a rule, increases by 10-15 kg, her breasts fill out and continue to grow. The areolas become darker.

The baby weighs up to 2.5 kg. Fetal growth is up to 49 cm. The baby's skin brightens, becomes smoother, but is still covered with a protective lubricant. It is designed to facilitate its passage through the birth canal and protect against pathogenic microorganisms. If a child is born prematurely, he will be able to breathe on his own without a special chamber and rehabilitation.

Week 35

At this stage of pregnancy, mothers should take special courses that will teach them how to behave during childbirth. In addition, it is important to think about choosing a maternity hospital and a doctor who will monitor the birth process. Many women decide to have a partner birth. At the same time, a husband or another close person can poke his head into the delivery room.

When walking, fatigue and shortness of breath occur due to a rather large belly. Doctors recommend not to overeat during this period. If the fetus is too large, the birth will be quite difficult.

At the 35th week of pregnancy, all the reflexes of a small person (sucking, swallowing, grasping) will improve. The amount of amniotic fluid becomes smaller, which causes discomfort to the baby. This becomes one of the first signals for the onset of labor. In the third trimester, the development of the respiratory, nervous, endocrine and other systems improves.

The fruit drops. In this case, the woman feels nagging pain in the back and lower abdomen. Soon after this, breathing becomes easier and discomfort in the back decreases.

36-39 weeks

At this stage, the child is fully formed. All organs and systems function in the right order. At this stage, the pregnant woman’s body is completely ready for the birth of a new life. At this stage, a woman should be able to distinguish false contractions from true ones. The following signs indicate the onset of labor:

• increased appetite;
• contractions are of a regulatory nature;
• vomiting and diarrhea often occur;
• amniotic fluid drains;
• the plug (mucus that covered the uterus) comes off.

If a pregnant woman develops such signs, she needs urgent hospitalization. The baby at that stage of pregnancy weighs from 3 to 3.5 kg. The baby's height is up to 55 cm.

The baby is formed and ready to be born. It is impossible to accurately calculate the date of birth and the sex of the child. The baby's date of birth can be calculated by knowing the first day of the last menstruation. This is the so-called obstetric period.

40 weeks

At this time, most mothers expect a long-awaited acquaintance with their baby. All organs and systems of the baby are fully formed, he will meet the outside world. The further growth and development of the child will depend entirely on the care of the parents for the little man.

On many websites and forums about pregnancy you can find various graphs of the development and weight gain of the baby in the womb. We propose to consider one of these development lines.

The data in the table is approximate and may vary depending on the developmental characteristics of the fetus.

Correspondence of weeks and months of pregnancy: table

The ratio of weeks and months of pregnancy in the table.

Trimester	Month	A week
First	1	1-4
	2	5-8
	3	9-13
Second	4	14-17
	5	18-21
	6	22-26
Third	7	27-30
	8	31-35
	9	36-40

The date of onset of labor is calculated by the doctor. The date of birth of the baby can be determined with an error of 2-3 weeks according to the obstetric period. In addition, there are special calculators that can be used to approximately calculate the baby’s due date.

Video about intrauterine development

This video will help you learn more about fetal development.

Fetal development by week Photo

Future mothers are sensitive to the development of the baby they carry under their hearts and want to learn as much as possible about the processes happening to them during pregnancy , study with interest the stages of intrauterine growth of the fetus, carefully examine the pictures that depict in detail fetal development by week.

Gynecologists begin counting the pregnancy period from the first day of the last menstruation. Basic unit of time pregnancy- a week.
The first weeks for the unborn child - are very important, at this moment the health of the body and its vitality are formed.
It's good if pregnancy will be planned , then the woman will begin to lead a correct lifestyle and will protect the baby from many health problems. Below you will find detailed information about the formation embryo in the womb, you can consider the development of the fetus week by week - Pictures with all stages of intrauterine growth and development, as well as a description of the processes occurring at one stage or another of pregnancy.

Before turning to the photo with the stages of fetal development by week, let’s briefly familiarize ourselves with the main periods of formation of the organs of a little person during pregnancy. At 5-6 weeks, an embryo measuring 6 millimeters in size (like a pear seed) lives in a bladder with liquid. The formation of the nervous system occurs, the spine and brain appear. Two pairs of dimples for the eyes and ears are visible on the head. Digestive tract begins already at this stage of fetal development.

Only 2 weeks pass and the main internal organs of the fetus are already formed. In the eighth week of fetal development, the face takes on the necessary shape, the nostrils, the tip of a small nose, mouth, and tongue are noticeable. Begins to function inner ear . The fingers of the developing baby are also emerging.

12 weeks fetal development- the age of a ten-centimeter embryo in which the outlines of a human body are visible. At the twelfth week of fetal development, various systems and organs have already formed and are developing safely. Modernized ultrasound equipment allows you to find out the sex of the baby and see facial features at this stage of pregnancy.

The beginning of the second trimester of pregnancy is the period of fetal development when all the baby's milk teeth are formed. The gastrointestinal tract also develops at week 13, villi appear in the intestines , which in the future will speed up the process of digesting foods.

Up to the 21st week of fetal development, the size of the baby allows it to move in the womb in any direction. The length of the fruit is 26 centimeters, weight is 0.4 kilograms.

The little body is able to control its temperature from 29 weeks , the period of preparation for the birth of a baby and independent life begins.

At 31 weeks of development, the body is fully formed, all that remains is to gain weight. The child is already able to feel, his condition can change depending on the mother’s mood. Hearing is developed enough to recognize voices. Vision and smell also function.

The baby is ready to be born at 37 weeks. Now the birth cannot be called premature. Of course, ideally you need to wait a little. But the baby can already absorb and digest mother’s milk , epithelium with villi appears on the mucous membrane of the stomach and intestines, through which Nutrients pass from food into the blood . Peristalsis is working, the first feces - meconium - have formed.

Now let's take a closer look fetal development by week of pregnancy, and also turn to the photo of the formation of the embryo in the womb with brief explanations. As you can see, very important processes in the formation of the structure of the fetus take place already in the first weeks after conception, and the expectant mother needs to seriously change her lifestyle and adjust her diet from the first days . Visit your gynecologist regularly and undergo all necessary medical examinations.

Even pictures with stages of intrauterine development of the fetus by week clearly demonstrate the importance of the ongoing processes of formation of the baby’s internal organs. We hope that the information we post will help you better understand the processes what happens in your body during pregnancy and we want to wish you that the baby was born healthy and beautiful !
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