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The Endowment for Human Development
The Endowment for Human Development
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Responds to Sound


5 months

From The Biology of Prenatal Development.Buy Now

Script: By 20 weeks the cochlea, which is the organ of hearing, has reached adult size within the fully developed inner ear. From now on, the fetus will respond to a growing range of sounds.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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