OverviewThe first trimester of a pregnancy is a time of incredible growth and development. A 7-week fetus will have begun to develop all essential organs.
Update Date 7/14/2015
Updated by: Emily Wax, RD, The Brooklyn Hospital Center, Brooklyn, NY. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.