Definition:
The term for the baby during pregnancy until 10 weeks after the last menstrual period (8 weeks after fertilization). After 10 weeks' gestation, the baby is called a fetus.
Embryo
By Krissi Danielsson, About.com Guide
Updated May 31, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Explore Miscarriage / Pregnancy Loss
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