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In the placenta, nutrients, wastes, and gases are exchanged between the mother's blood and the baby's blood.

Review Date 7/28/2014

Updated by: Cynthia D. White, MD, Fellow American College of Obstetricians and Gynecologists, Group Health Cooperative, Bellevue, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.