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Inside Pregnancy: Weeks 1-9
1-9 周胚胎的发育过程
Within a week of conception, your fertilized egg, known as a blastocyst, will make its way to your uterus. The egg is about the size of a pen tip.
在受孕 1 周内，受精卵，或囊胚将进入子宫。此时，受精卵约笔尖大小。
In days, the cells in the egg arrange themselves into groupings. The inner cell mass will become your baby. The outer cells will become the amniotic sack and placenta.
几天后，受精卵细胞分裂成细胞团。内细胞团将发育成胚胎，外层细胞将发育成羊膜囊和胎盘。
The blastocyst then sheds its protective casing in a process called hatching and burrows into the lush uterine wall.
然后，囊胚孵化，保护壳脱落，囊胚埋入肥厚的子宫壁。
Around week five, your developing baby is the size of a sesame seed.
第 5 周左右，胚胎发育到芝麻籽大小。
The cells that once formed the blastocyst's inner cell mass begin organizing and arranging, giving shape to the young embryo and forming primitive organs.
形成囊胚内细胞团的细胞开始组织排列，形成幼胚和原始器官。
Your baby's brain and spinal cord are visible through his translucent skin. Right around this time, your baby's circulatory system also forms and his heart begins to beat. Your baby looks more like a tiny tadpole than a human.
我们可以通过半透明的皮肤观察宝宝的大脑和脊髓。此时，宝宝也形成了循环系统，它的心脏开始跳动。宝宝看起来更像是一只小蝌蚪，而不是人。
He's drawing nutrients and oxygen through the newly formed placenta and umbilical cord.
它将通过新形成的胚胎和脐带吸收营养和氧气。
By week nine, the embryonic tail is gone.
第 9 周，胚胎的尾巴消失。
Your baby's looking more human every day, with protruding limbs and fingers, a defined nose, mouth, and eyes, and tiny earlobes. Our new resident is about the size of a grape and weighs a fraction of an ounce.
胎儿初具人形，四肢和手指日益突出，鼻、口和眼分明，也有微小的耳垂。此时，胎儿约葡萄大小，体重不足 1 盎司（约 28.35 g）。
It's hard to believe how rapidly one cell evolves in such a short time into the unmistakable body of a baby.
这太令人难以置信了，1 个细胞竟然能够在这么短的时间内迅速进化为人形！
Amniotic
Blastocyst
-cyst 囊
（图源：太帅图库）
附：酒精对胎儿发育的影响
（图源：太帅图库）
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