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The Endowment for Human Development
The Endowment for Human Development
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Playlist: Facial Expressions

The External Ear

#219, Movie 1 of 30

7 months, 3 weeks

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Script:

between high- and low-pitched sounds.

By 30 weeks, breathing movements are more common and occur 30 to 40% of the time in an average fetus.
From The Biology of Prenatal Development.Buy Now
    All ages referenced to fertilization, not last menstrual period.
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