Stages of pregnancy

Understanding Each Trimester of Your Pregnancy
Learn how to navigate the first, second, and third trimesters.

You will encounter different experiences during each of your trimesters as your little miracle develops.
Stages of Pregnancy: First, Second and Third Trimester

A pregnancy is divided into three stages called trimesters: first trimester, second trimester, and third

Stages of pregnancy

Pregnancy lasts about 40 weeks, counting from the first day of your last normal period. The weeks are grouped into three trimesters. Find out what's happening with you and your baby in these three stages.
First trimester (week 1–week 12)
Second trimester (week 13–week 28)
Third trimester (week 29–week 40)
Your developing

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Pregnancy and Fetal Development / Picture of First Trimester (8 Weeks)
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Picture of First Trimester (4 Weeks)
Picture of First Trimester (4 Weeks)
First Trimester: The Baby at 4 Weeks

Your baby's brain

KidsHealth / Parents / A Week-by-Week Pregnancy Calendar

A Week-by-Week Pregnancy Calendar
Reviewed by: KidsHealth Medical Experts

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en español Calendario del embarazo semana a semana

Want to know what to expect during your pregnancy? You've come to the right place! Our illustrated pregnancy calendar is

Pregnancy: What to Know About How You're Carrying
By WebMD Editorial Contributors
Reviewed by Dan Brennan, MD on March 12, 2021
In this Article

How Are You Carrying? Why You’re Carrying Small, Low, High, Large, or Wide

The way you carry has everything to do with the tone of