Pregnancy 5 weeks - development of the fetus

The development of the fetus at the time of 5 weeks of pregnancy is fast. At this stage it is still a small blastocyst, which only penetrates into the mucous membrane of the uterine cavity. At the same time, the fetus receives all the food from the mother, through her blood. The ovary, which released the mature egg, continues to produce progesterone, thanks to which pregnancy is maintained.

What does the baby look like for 5 weeks?

At the fifth week of embryonic development, the baby is like a tadpole for the time being. The length of his body to a given time almost never exceeds 2 mm. However, despite such small sizes, the heart of the embryo at this time already begins to decline. There is activation of the development of most of the internal organs of the unborn child. Also, facial features are beginning to form, and in appearance it remotely resembles an adult. Thus, it is already possible to distinguish the nostrils, the primary parts of the eyes develop which are very sensitive to light radiation.

What changes occur in the body of the embryo at week 5?

Development of the fetus at the 5th week of pregnancy continues with the formation of extraembryonic organs, which are responsible for normal life support, while still embryo. So at first some villi of the chorion were simple protrusions, and now in each of them a capillary sprouts. After that, the baby begins to eat not by destroying the tissue cells that surrounded him, but gets all the necessary nutrients from his mother. It is the blood of the pregnant woman that will bring all useful elements to the baby, washing the villus of the chorion. As a result of such changes, at the 5th week of embryo development, utero-placental blood circulation is organized.

Formed to this date, the primary placenta is taken for work. It begins to perform the functions of respiration, nutrition, as well as isolation and regulation, blood circulation in the intervillous space, assigned to it. In addition, it is the placenta that suppresses the immune system of the mother, which prevents rejection of the fetus at an early stage.

All of the above functions only begin to germinate at the 5th week of pregnancy and contribute to the further development of the child. The placenta is not yet fully capable of protecting the embryo from harmful external influences. That is why this period of bearing fetus obstetricians is called critical, tk. there is a high probability of spontaneous abortion.