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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: Pediatric textbooks describe the ability to "roll over" as appearing 10 to 20 weeks after birth. However, this impressive coordination is displayed much earlier in the low-gravity environment of the fluid-filled amniotic sac. Only the lack of strength required to overcome the higher gravitational force outside the uterus prevents newborns from rolling over.

All ages referenced to fertilization, not last menstrual period.
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The Highly Complex Brain
The Highly Complex Brain
Right- and Left-Handedness
Right- and Left-Handedness
Rolling Over
Rolling Over
Spontaneous Movement
Spontaneous Movement
Reflexive Movement
Reflexive Movement
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Epidermis and Hair
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