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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: 儿科教科书描述 "翻身"的能力 在出生后10至20周出现。 然而,这种令人 印象深刻的协调 展现得更早, 是在充满液体的 羊膜囊内低地心吸力 的环境中。 新生儿不能翻身, 只是因为缺乏力量, 不能克服子宫外 更大的地心吸力。

All ages referenced to fertilization, not last menstrual period.
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