What Is A Trimester?
The
word trimester means "three months." This is often a source of confusion, because
a normal pregnancy is 40 weeks, a tad longer than nine months. Nevertheless,
health care providers and pregnant women talk about three trimesters to help
give pregnancy a beginning, middle, and end. Most providers actually talk about
your pregnancy in weeks, rather than months or trimesters.
Most commonly, the first trimester is defined as from conception through week
14. The second trimester is from week 14 through week 28. And the third trimester
is from week 28 through labor and deliver, which varies considerably but averages
at week 40.
Review Date: 2/6/2007
Reviewed By: Douglas A. Levine, MD, Gynecology Service, Memorial Sloan-Kettering Cancer Center, New York, NY. Review provided by VeriMed Healthcare Network.
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