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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: Buku-buku teks pediatrik menjelaskan keupayaan "berguling" bermula 10 - 20 minggu selepas kelahiran. Bagaimana pun, koordinasi mengagumkan ini berlaku lebih awal dalam kantung amnion berisi bendalir yang bergraviti rendah ini. Hanya ketiadaan kekuatan yang diperlukan untuk mengatasi tarikan graviti lebih tinggi di luar uterus menghalang bayi berguling.

All ages referenced to fertilization, not last menstrual period.
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