The Difference Between an Embryo and a Fetus

By Beth Ann Mayer, Nov 14, 2023

The second trimester begins at 13 weeks, explains Kecia Gaither, MD, MPH, MS, MBA, FACOG, a double board-certified OB-GYN and maternal fetal medicine specialist, and director of perinatal services/maternal fetal medicine at NYC Health + Hospitals/Lincoln in the Bronx. The odds of miscarriage drop to about 1-5%.⁴ During the second trimester, Dr. Gaither says the fetus’s kidneys start to function by making amniotic fluid, or fetal urine.

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