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The Endowment for Human Development
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Blink-Startle Response


6 months

From The Biology of Prenatal Development.Buy Now

Script: By 24 weeks the eyelids reopen and the fetus exhibits a blink-startle response. This reaction to sudden, loud noises typically develops earlier in the female fetus.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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Age of Viability
Age of Viability
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Blink-Startle Response
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