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The Endowment for Human Development
The Endowment for Human Development
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The Heart in Action

#021, Movie 1 of 10

7 months, 2 weeks

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During the last 4 months of pregnancy, the fetus displays periods of coordinated activity punctuated by periods of rest. These behavioral states reflect the ever-increasing complexity of the central nervous system.
From The Biology of Prenatal Development.Buy Now
    All ages referenced to fertilization, not last menstrual period.
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