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The Endowment for Human Development
The Endowment for Human Development
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Spontaneous Movement


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: 這個時候,胚胎更加 活耀運動。

運動可能慢或快、 一次或者重復、 自發或者反射。

更加經常發生 頭轉動、俯臥抬頭、 手與臉接觸。

All ages referenced to fertilization, not last menstrual period.
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