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Fetal and pregnancy dates

Fetal and pregnancy dates are not the same-when a woman is 24 weeks pregnant, her growing baby (fetus) is about 22 weeks old. This is because the start of the pregnancy is counted from the first day of her last menstrual period (LMP), but the embryo doesn't start growing until about 2 weeks later.

Author Shannon Erstad, MBA/MPH
Editor Kathleen M. Ariss, MS
Associate Editor Pat Truman
Primary Medical Reviewer Renée M. Crichlow, MD
- Family Medicine
Specialist Medical Reviewer Kirtly Jones, MD
- Obstetrics and Gynecology
Last Updated November 30, 2006

WebMD Medical Reference from Healthwise

Last Updated: November 30, 2006
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