Life in the first week of the fertilized egg after many division, forming a group of cells in the second week of formed the spine, brain, spinal cord and nervous system, and the eyes, have a certain shape fetal brain tissue also began to form the third week of the fourth week in the heart, weeks limb bud, with eyes, ears, lung, liver and started to shape the embryo to 7 weeks, brothers started to fingers, toes, eyes clear, embryo started to straighten and activities in the amniotic fluid, the whole appearance of the approximate infants, tail disappear.L in 8 weeks pregnancy, neural tube gradually healing, l week 8: fetal head of whole body l / 2, after growth accelerated, l began to be called a fetus.Nearly 3 cm embryos, all the parts have begun to take.After a few months only to be gradually improved.L at 9 weeks, fetal genital is roughly similar to men and women.The twelfth weekend, has shown that men and women mature fetal genital form l (12-15 weeks), the fourth month fetus is 16 cm in length and weighing about 120 grams, grow very quickly.L (16-19 weeks), 5 months pregnant women will feel internal fetal playing himself to show his existence, this is quickened.L have listening, can hear the sound, can be started in utero.6 months (20 to 23 weeks), two arms bend before the bosom, two knees referred to the abdomen.The seventh month (24-27 weeks), looks like a little old man.Then born can have shallow breathing and crying, but still it is hard to survive.L 8 months (28-31 weeks), the nervous system to further improve, lungs and other internal development has been finished.• 9 months (32-35) over the weekend, basically completed.., the first ten months (36 -- 40 weeks), fetal development is complete, a new life was born