Your heart beats faster than usual
The fourth month of pregnancy, another month and a new quarter begins. Time passes slowly but surely. This is the beginning of your second trimester.
During this month, your baby will grow because its growth rate will reach a maximum. Its organs are now in place and began to operate.
During the fourth month of pregnancy, relationships will be established between the bodies will learn to work together, each subordinate body of the work of another and eventually govern the entire organism.
At this stage, your child has the color of a shrimp because her skin is transparent and allows to distinguish its network of blood vessels. His heart beats three times faster than yours and his first hair starts to grow on his head.
As for you, you enter a special time where you will feel good. You will experience something new.
While you will lie quietly, you will suddenly feel a slight movement in you. This is your baby moving! For the first time, you'll realize it really is in you.
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Weeks of the fourth month
16 17 18 19
The 16th week of gestation (the fourth month of pregnancy)
The baby
Its size is 14 cm. It weighs 110 grams. The diameter of his head is at about 3.6 cm. It begins to be more active from this week. In addition to the involuntary physical movements of the arms and legs, he is able to open your mouth, turn your eyes and frown.
His heart beats twice as fast as that of the mother: between 110 and 120 beats per minute. He can be heard through ultrasound. The sense of touch begins to develop in the baby.
The mother
Your heart beats a little faster than usual: it is because your body is working hard. The intense emotions that you live there are not quite foreign. Remember to weigh yourself regularly!
The 17th week of gestation (the fourth month of pregnancy)
The baby
Its size is 16 cm. It weighs 135 grams. The diameter of the head measured by the ultrasound is 3.9 cm. The length of the foot is 2 cm. It moves in amniotic fluid.
The lungs have not yet function as an organ of respiration.
However, pseudo-respiratory movements take place. They are still infrequent, rapid and irregular.
These movements of the chest rises and falls have resulted in bringing in the lungs of amniotic fluid and then expel it.
Your baby is breathing through your blood. You bring in oxygen and get rid of carbon dioxide he rejects. That's why he did not need his lungs yet.
He can hear the voice of her mother, her gurgling and its heart beat and thanks to the amniotic fluid.
The mother
The large amount of progesterone you produce has the effect of releasing all your smooth muscles. The unwanted side effect is a slowing of intestinal functions.
Do not settle constipation. Avoid it for food too sweet. Eat natural products rich in fiber.
If your constipation is persistent, do not take any medication without medical advice.
The 18th week of gestation (the fourth month of pregnancy)
The baby
Its size is 17.5 cm. Its weight is 160 grams. The length of the foot is 2.5 cm and the diameter of its head is 4 cm.
The ears are beginning to be up on the sides of the head while the eyes are very closely spaced. He can see the bright lights of his eyes out but remain closed.
His whole body is covered with very fine down, soft as silk called lanugo. He will fall at birth.
It can be seen on ultrasound as:
- the hand that is close to the mouth
- swallowing movements
- the plantar reflex indicating that the sense of touch is
- the movements of the respiratory muscles
- the brain
- the placenta
The mother
Between the 16th and 20th week, the ideal time to practice a second ultrasound. This allows a precise study of all the external physical structures of your baby to detect any abnormalities of training.
Your baby's movements become more clear: you have fun guessing if it's a foot, hand, knee or head as you feel.
The 19th week of gestation (the fourth month of pregnancy)
The baby
Its size is 19 cm. It weighs 200 grams. The diameter of his head is now 4.5 cm. His skin has acquired its definitive constitution.
His gut continues to grow. While stretching it bypasses and takes its final position. A small expansion appears: what is the appendix!
In the intestine, a substance called meconium begins to accumulate. At birth, the baby will eliminate the meconium. This will be the first active movement of the intestines.
His skin is formed but is still transparent: we see all through his veins. By cons, it is protected by the vernix, is a kind of plaster.
The mother
From the fourth month of pregnancy, we measure the uterus each month to monitor the baby's growth. Records the result on your case next to the letters H. U. which mean: Uterine height.
Uterine size is the distance taken from the top edge of the pubis and the fundus.
Your doctor also takes your weight, blood pressure and always, every month, albumin and blood sugar in the urine.