Economics,Medicine,Sports: Yolk sac: The yolk sac produces your baby's red blood cells and delivers nutrients until the placenta is ready to take over this duty.

Thursday, 12 March 2015

Yolk sac: The yolk sac produces your baby's red blood cells and delivers nutrients until the placenta is ready to take over this duty.

http://www.babycenter.com/fetal-development-images-4-weeks

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