Nature has taken care of babies and endowed them with many features that help them grow in the womb.
Six fontanelles at once
Adult skull consists of several bones, firmly connected to each other, and only the lower jaw can move.In the fetus, there are layers of connective tissue in the mother's stomach between the bones. They can move to help the baby's head pass through the mother's pelvis during labor.
Instead of water and air
The fetus is in a bladder that fills with amniotic fluid or amniotic fluid.
In the early stages, it is produced by the mother's body, but after the 20th week it is almost entirely composed of the urine of the baby himself.
From this fluid, the child receives all the necessary substances, including hormones and antibodies that protect against infections.
Superhemoglobin
Hemoglobin is responsible for oxygenation of all organs and tissues of the body, but in the fetus and here everything is not so simple!The child has a special hemoglobin, doctors call it fetal. Compared to regular hemoglobin, this one has a number of additional abilities and is better at binding oxygen.
"Incorrect" blood circulation
The fetus breathes through the placenta, so the circulatory system does not work as well as one might think. There are significant differences! Arterial blood enters through the umbilical vein from the placenta, then into the right atrium, left atrium, left ventricle, aorta and is carried through the tissues of the body.
Only after birth does the blood circulation become classical, and all the extra openings are closed.
Thick (but almost invisible) "fur"
From the 16th week of pregnancy, the child's body is covered with colorless hairs, outwardly they resemble fluff and are barely noticeable.The hairs are designed to help the baby to keep warm, because a layer of fatty tissue has not yet grown under the skin.
The fluff completely disappears from the baby's body by 7-8 months of pregnancy.
Recall
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- how to recognize pneumonia due to coronavirus?
