All the interior organs formed in the first four weeks keep on growing during the second month. A small hollow (impression) along with the chord grows. That process becomes the origins of the nerve system. At the beginning of the second month a small tubercles are noticeable at the forward part of the fetus: this is the brain.
In the 5th week top and lowest finiteness are clearly visible. Definitely, they don’t look like legs and hands. They appear as convexity along with the fetus.
There is a small excrescence on the spot of future belly shows the growth of the hearth which is larger in cooperation with the embryo.
A little lower there is the umbilical cord and baby feeds trough it.
At the beginning of the 6th week the embryo grows up to 6-7 mm. At this moment all the spinal vertebras has already formed and count 40. The head is bended forward and take normal position in the 9th week.
The interesting fact is that at 1.5 month period the face outlines are visible.
Two small saliencies appear positioned far from each other on the place of future eyes. Ears appear like dimples. The nose and mouth still in the formation process and look like aperture or opening.
In the eight week the length of the embryo is 12-14 mm. The head is still ahead but not as far as before. Started at this time it grows faster and soon become 1/3 part of the embryo.
During this week the legs and hands grows fast. The peculiarity is that they have the same length and speed of development.
Small enlargements appear at the ends of the finiteness. These are the hands and the feet. 5 small consolidations then form as a base for the future figures.
At the end of the 8th week hands and feet start to bend: so later elbows and knees from on those spots. The hands are pressed to the body and the legs are pulled to the belly.
During the 7-8 weeks the formation of the face continues. Now it more alike the human face. Big eyes, which look like that because of absence of eyelids, come closer. Big forehead and mount gradually become proportional.
At the end of the second month the digestive system finishes its formation. The belly takes its position, intestines extend and change. The cloacae so on has more then one openings for the intestines and urine system.
The brain now has more than three convexity and sufficient number of bends. In this phase the quantity of these bends match with the same as human has. Consequently the formation of the neural system is about to finish.
In the eight week the heart of the embryo become four-chamber and keeps on to shorten. But the blood circulatory system has not finally finished yet.
That process ends just before the birth. During this time large veins divide into small ones and cover the entire body.
One of the significant events is the formation of the muscle system during this time, which starts to function in the next month. That enables the baby to do his/her first motions. The skeleton ossification starts in the second month and finishes long after the birth. Then the baby grows on the extend of his/her own bones.
The sex organs grow fast at this time but it is still hard to distinguish the sex. It is possible to do at the beginning of the next month by a special examination. So at the end of the second month embryo has 2.5 cm length and 10 gram weight. All the interior organs are done with formation and continuing further development.
Obviously the first two months are the most important ones. The mother should prevent any kind of impact and save the baby. So the further progress of the pregnancy and health conditions of the baby depends on this period.
It is worth to pay attention on the fact that the placenta hasn’t formed yet, consequently the embryo isn’t protected. It takes everything whatever the mother provides. That is way cigarettes and alcohols are very dangerous in this time.
