WEBVTT

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Pediatric textbooks describe
the ability to "roll over"

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as appearing
10 to 20 weeks after birth.

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However, this impressive
coordination

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is displayed much earlier
in the low-gravity environment

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of the fluid-filled
amniotic sac.

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Only the lack
of strength required

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to overcome the higher
gravitational force

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outside the uterus prevents
newborns from rolling over.