« Previous Page
A normal pregnancy lasts about 40 weeks from the first day of your last menstrual period to the
birth of a baby. This time is roughly divided into 3 periods: the first
trimester, from the first day of your last menstrual period to about the 12th week of pregnancy; the second
trimester, from about 13 to 27 weeks of pregnancy; and the third trimester,
from about 28 weeks of pregnancy until birth.
Each trimester of pregnancy is marked by developmental changes in
Current as of:
May 22, 2015
Sarah Marshall, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.