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Normal Pregnancy: First Trimester

Fetal development in the first trimester

The first trimester lasts from week 1 through week 12.

Current as of: May 29, 2019

Author: Healthwise Staff
Sarah A. Marshall, MD - Family Medicine
Adam Husney, MD - Family Medicine
Kathleen Romito, MD - Family Medicine
Kirtly Jones, MD - Obstetrics and Gynecology, Reproductive Endocrinology