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The Endowment for Human Development
The Endowment for Human Development
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Breathing Motions


8 weeks, 2 days

From The Biology of Prenatal Development.Buy Now

Script: Although there is no air in the uterus, the embryo displays intermittent breathing motions by 8 weeks.

All ages referenced to fertilization, not last menstrual period.
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Kidneys Produce Urine
Kidneys Produce Urine
Eyelid Fusion
Eyelid Fusion
Breathing Motions
Breathing Motions
4D Ultrasound
4D Ultrasound
Fetal Period Begins
Fetal Period Begins
Motion and Sensation
Motion and Sensation
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