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The Endowment for Human Development
The Endowment for Human Development
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The Fetus Yawns


10 weeks

From The Biology of Prenatal Development.Buy Now

Script: By 10 weeks, stimulation of the upper eyelid causes a downward rolling of the eye.

The fetus yawns and often opens and closes the mouth.

All ages referenced to fertilization, not last menstrual period.
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