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The Endowment for Human Development
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Spontaneous Movement


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: 这个时候,胚胎更加 活耀运动。

运动可能慢或快、 一次或者重复、 自发或者反射。

更加经常发生 头转动、俯卧抬头、 手与脸接触。

All ages referenced to fertilization, not last menstrual period.
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