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Calendar of development of the child in the womb

The second week

In the body, women are practicallySimultaneously two important biological cycles: ovulation - the appearance of a mature egg, ready for fertilization; And during the endometric cycle, the uterine wall is prepared for the implantation of a fertilized cell. Both cycles are closely related to each other, because endometrial changes are regulated by hormones that are secreted in the ovary.

The third week

Egg and sperm met in the uterusPipe. As a result of their merger, a zygote was formed - the first and most important cell of the unborn child. All the subsequent 100 000 000 000 000 cells of his body are the daughters of the zygote! Three days after fertilization, the embryo consists of 32 cells and is similar in shape to the mulberry berry. By the end of this week, the number of cells will increase to 250, the shape will resemble a hollow ball with a diameter of 0.1 - 0.2 mm.

Fourth week

The fetus is at the earliest stage of developmentIts height can be from 0.36 to 1 mm. The implanted blastocyst plunged deeper into the mucous membrane of the uterus, and the amniotic cavity began to form. Here in the future will be a placenta and a vascular network containing maternal blood.

Fifth week

This week the fetus undergoes significantChange. First, its shape is changing - now the kid no longer looks like a flat disk, but more like a cylindrical 1.5 - 2.5 mm long. Now doctors would call the baby an embryo - this week the heart will start beating!

Sixth week

Rudiments of the brain develop rapidly andExtremities. The head assumes familiar outlines, eyes, ears appear. Inside the fetus, the simplest versions of internal organs are formed: the liver, lungs, etc.

Seventh week

At the same time of pregnancy,The inner ear of the baby, the outer ear develops, the jaws are formed, and the rudiments appear. The baby has grown - its length is 7 - 9 mm, but, most importantly - the baby starts to move!

Eighth week

The kid has become quite like an adult. Heart beats, the stomach produces gastric juice, kidneys start functioning. The muscles contract under the influence of impulses coming from the brain. By the blood of a child, you can determine its Rh-belonging. Fingers and joints were formed. The face of the baby acquires its own features, the facial expression begins to reflect what is happening in its environment. The child's body reacts to touch.

Ninth week

The length of the baby from the crown to the sacrum is approximately 13-17 mm, weight - about 2 g. There is an intensive development of the brain - this week begins the formation of the cerebellum.

The tenth week

The length of the baby from the crown to the sacrum isApproximately 27-35 mm, weight - about 4 g. The general parameters of the body are laid, the fingers are already detached, a taste bud of the tongue and dental rudiments appear. The tail is gone (it disappears this week), the brain continues to evolve. The heart of the embryo is already formed.

The eleventh week

The length from the crown to the sacrum is approximately 55Mm, weight - about 7 g. The intestine starts working, carrying out contractions reminiscent of peristalsis. This week marks the end of the embryonic period: henceforth the future child is called the fruit.

Twelfth week

The length from the crown to the sacrum is approximately 70-90 mm. Weight - about 14-15 g. The liver of the baby is already beginning to produce bile.

Thirteenth week

The length from the crown to the sacrum is 10.5 cm. Weight - about 28.3 g. All twenty dairy teeth have formed.

Fourteenth week

The length from the crown to the sacrum is 12.5 - 13 cm. Weight - about 90-100 g. This week is important for internal organs. The thyroid gland is sufficiently formed to produce hormones. The boy appears prostate, in girls the ovaries descend from the abdominal cavity to the hip area.

Fifteenth week

The length from the crown to the rump is 93-103 mm. Weight - about 70 g. On the head of the baby appear hair.

Sixteenth week

The length from the crown to the rump is 16 cm. Weight is about 85 g. Eyebrows and eyelashes appear, the child already holds the head straight.

Seventeenth week

The length from the crown to the sacrum is 15-17 cm. Weight is about 142 g. No new structures were formed this week. But the kid learns to use everything that he has.

Eighteenth week

The total length of the baby is already 20.5 cm. Weight is almost 200 grams. Continues to strengthen the bones of the fetus. Phalanges of fingers and toes are formed.

Nineteenth week

Growth continues. This week, the fruit weighs about 230 grams. If you have a girl, she already has primitive eggs in her ovaries. Formed already are the rudiments of permanent teeth, which are located deeper than the rudiments of infant teeth.

Twentieth week

The length from the crown to the sacrum is about 25 cm. Weight is about 283-285 g. The original grease is formed - a white grease-like substance that protects the baby's skin in the uterus

Twenty-first week

The length from the crown to the sacrum is about 25 cm. Weight - about 360-370 g. Fruit freely moves inside the uterus. The digestive tract is already able to separate water and sugar from the baby's swallowed amniotic fluid and pass its fibrous contents right up to the rectum.

Twenty-second week

The fruit weight is about 420 grams, and the length is 27.5 centimeters. The fetus continues to grow and prepare itself for life outside the uterus.

Twenty-third week

The length from the crown to the sacrum is about 30 cm. Weight - about 500-510 g. The child continues to swallow small amounts of the surrounding fluid and remove it from the body in the form of urine, the child accumulates meconium (original feces).

The twenty-fourth week

The length from the crown to the sacrum is about 29-30 cm. Weight - about 590 - 595 g. In the skin, sweat glands are formed. The baby's skin thickens.

Twenty-fifth week

The length from the crown to the sacrum is about 31 cm. Weight - about 700-709 g. Continued intensive strengthening of the osteoarticular system. The sex of the child has finally been determined. The testicles of the boy begin to descend into the scrotum, and the girls form the vagina.

Twenty-sixth week

The length from the crown to the sacrum is about 32.5-33 cm. Weight - about 794 - 800 g. This week the child is already gradually opening his eyes. By this time they almost completely formed.

Twenty-seventh week

The length from the crown to the sacrum is about 34 cm. Weight - about 900 g. Your baby's skin is very wrinkled because of swimming in the amniotic fluid. From this week, the child's chances of surviving in the case of preterm delivery are 85%.

The twenty-eighth week

The length from the crown to the sacrum is about 35 cm. Weight - about 1000 g. Now the kid uses the whole set of feelings: sight, hearing, taste, touch. His skin thickens (thickens) and becomes more like the skin of a newborn.

Twenty-ninth week

The length from the crown to the sacrum is about 36-37 cm. Weight - about 1150 - 1160 g. The child begins to regulate his own temperature, and his bone marrow is fully responsible for the production of red blood cells of blood. The child urinates about half a liter of urine in the amniotic fluid daily.

Thirtieth week

The length from the crown to the sacrum is about 37.5 cm. Weight - about 1360 - 1400 g. The child is already beginning to train his lungs, rhythmically lifting the chest, which sometimes leads to hitting the amniotic fluid in the wrong throat, causing a hiccup.

Thirty-first week

The length from the crown to the sacrum is about 38-39 cm. Weight - about 1500 g. In the alveolar sacs appeared a layer of epithelial cells that produce surfactant. This surfactant spreads the lungs, allowing the child to draw in air and breathe on his own. Because of the increase in subcutaneous fat, the baby's skin does not seem red, as before, but pink.

Thirty-second week

The length from the crown to the sacrum is about 40 cm. Weight - about 1700 g. The baby is formed subcutaneous fat, the arms and legs become plump. There is a bookmark of the immune system: the baby starts receiving immunoglobulins from the mother and intensively forms antibodies, which will protect it in the first months of life. The volume of amniotic fluid surrounding the child is one liter. Every three hours they are completely updated, so the kid always "swims" in clean water, which can be swallowed without pain.

Thirty-third week

The length from the crown to the sacrum is about 42 cm. Weight is about 1800. By this time the child has already turned head down: he is preparing for the birth.

Thirty-fourth week

The length from the crown to the sacrum is about 42 cm. Weight - about 2000. The hair on the child's head became much thicker, the baby has almost dropped the embryo fluff, but the layer of original grease becomes even more abundant.

Thirty-fifth week

The length from the crown to the sacrum is about 45 cm. Weight - about 2215 - 2220 g. This week the child's nails have grown to the very edge of the fingers. The deferring of fat tissue continues, especially in the forehearth region: the baby's shoulders become round and soft. Pushok-lanugo gradually disappears from him.

Thirty-sixth week

The length from the crown to the sacrum is about 45-46 cm. Weight - about 2300 g. From the ninth month of pregnancy the baby daily adds in weight from 14 to 28 g per day. In his liver, iron accumulates, which will help the hematopoiesis in the first year of the larvae on earth.

Thirty-seventh week

The length from the crown to the sacrum is about 48 cm. Weight - about 2800 g. Fat deposits continue to accumulate at a rate of 14 grams per day, and the formation of the myelin layer of certain neurons of the brain is only just beginning (it will continue after birth).

Thirty-eighth week

The length from the crown to the sacrum is about 50 cm. Weight is about 2900 g. The child now adds 28 grams per day. Usually at 38 weeks his head goes down to the entrance to the small pelvis.

Thirty-ninth week

The length from the crown to the sacrum is about 50 cm. Weight is about 3000 g. The nails on the legs have grown completely.

Fortieth week

The birth of a child at 38-40 weeks is the norm. By this time the usual length of a newborn is 48-51 cm, and the average weight is 3000-3100 grams.

Forty-first and forty-second weeks

Only ten percent of women go to such a time. For the baby it is absolutely harmless - it only adds weight.

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