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The Endowment for Human Development
The Endowment for Human Development
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Rolling Over


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: 兒科教科書描述 "翻身"的能力 在出生後10至20週出現。 然而,這種令人 印象深刻的協調 展現得更早, 是在充滿液體的 羊膜囊內低地心吸力 的環境中。 新生兒不能翻身, 只是因為缺乏力量, 不能克服子宮外 更大的地心吸力。

All ages referenced to fertilization, not last menstrual period.
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The Highly Complex Brain
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Rolling Over
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