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Head and tail of fold formed gradually to bend and further embryo body is C, where has appeared in measurements neural tube closed, 1, 2, 3, to bow, the inner ear or one of the nest also hear clearly visible. In the embryo vice outside surface, small uplift, then shoots, upper and lower limbs of the fourth or bow shoots, vessels, cells.
The fifth week (first week 14, 15) with the changes of embryonic form of smaller than has been around, but now the head of each part of the fast growth compared with other mainly because of the brain, the embryo rapidly increased significantly to the head, soon to ventral heart uplift, the second phase contact or bow backward growth over the third bow, forming four gills outside the sag, called PeiCeng carotid sinus. With the upper hand, start showing section of change.
6 weeks in the 16th and 17th (first) limb buds have been shown to the section is more obvious changes. Upper buds and recognizable more obvious elbows and wrist. Gills bow occur around several small uplift, it has evolved into a ditch cheeks, demodectic pruritus small uplift while around and gradually become WaiErMen retinal pigment, began to appear, make eye has become more and more obvious. Then the head and the embryo of embryonic body is much larger than that in the head bent status, the embryo heart uplift trunk and neck began to grow straight to the sixth weekend, measurements of compre ion in the waist.
Article 9 months early fetal head of the fetus is a half of fetal body, and later, to the hips, long weekend more than doubled. The head of the growth rate is more than the rest of the fetus, slowing down a lot. The fetal face, eye apart by ear, low position. Because of eyelid, conjunctival sac and closed. At the same time, the fetal external genitalia gradually differentiation.
The first four months of fetal rapid growth, end relatively small head and legs are relatively longer, bone rapidly GuHua, skin, transparent, deep red.
The fifth month fetus began slowing growth speed, the length of the lower extremities has reached the final of the fetus ratio, usually can be mother felt, called quickened. The skin surface lipids, covering tire begin to protect fetus skin, head and at the end, there appeared TaiMao eyebrows and hair, brown fat is in this form. Sound can be heard TaiXin.