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The Endowment for Human Development
The Endowment for Human Development
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The Maturing Heart


6 weeks, 6 days

From The Biology of Prenatal Development.Buy Now

Script: The 4-chambered heart is largely complete. On average, the heart now beats 167 times per minute.

Electrical activity of the heart recorded at 7 1/2 weeks reveals a wave pattern similar to the adult's.

All ages referenced to fertilization, not last menstrual period.
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Nipple Formation
Nipple Formation
Hand Movement
Hand Movement
The Maturing Heart
The Maturing Heart
The External Ear
The External Ear
Hiccups & Startle Response
Hiccups & Startle Response
Joining Hands
Joining Hands
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