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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: Livros de pediatria descrevem a habilidade de "virar" aparecendo de 10 a 20 semanas após o nascimento. No entanto, essa coordenação impressionante é exibida muito mais cedo, no ambiente de baixa gravidade do saco amniótico cheio de líquido. Só a falta de força exigida para superar a força gravitacional mais alta fora do útero evita que os recém-nascidos virem.

All ages referenced to fertilization, not last menstrual period.
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