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Little One Pregnancy Calendar & Journal

Baby’s Pregnancy Calendar


The Folding of the Embryo

3 weeks old / 5 weeks pregnant (since LMP)

 
From The Biology of Prenatal Development.Buy Now

Script: Between 3 and 4 weeks, the body plan emerges as the brain, spinal cord, and heart of the embryo are easily identified alongside the yolk sac.

Rapid growth causes folding of the relatively flat embryo. This process incorporates part of the yolk sac into the lining of the digestive system and forms the chest and abdominal cavities of the developing human.

See Snapshots
The Folding of the Embryo
The Folding of the Embryo
The Heart in Action
The Heart in Action
Hand Plates and Cartilage
Hand Plates and Cartilage
Hand Movement
Hand Movement
Fingers and Toes
Fingers and Toes
Spontaneous Movement
Spontaneous Movement
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