A Week-by-Week Pregnancy Calendar

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Congratulations! Pregnancy is an exciting time and a great opportunity to learn about your child's growth and development. But with so much pregnancy information available in books, in magazines, and on websites, how can you hope to cover it all before giving birth?

We've made it easy for you to get all the pregnancy info you need in one place. Our illustrated pregnancy calendar is a detailed guide to all the changes taking place in your baby — and in you! Each week of pregnancy includes a description of your baby's development, as well as an explanation of the changes taking place in your body. You'll also find important medical info that will help keep you and your baby healthy.

A Word About Due Dates and Trimesters

After you announce your pregnancy, the first question you'll probably be asked is "When are you due?" At your first prenatal visit, your health care provider will help you determine an expected delivery date (EDD). Your EDD is 40 weeks from the first day of your last menstrual period (LMP). If you deliver on your EDD, your baby is actually only about 38 weeks old — that's because your egg didn't become fertilized until about 2 weeks after the start of your last menstrual period.

It's important to remember that your due date is only an estimate — most babies are born between 38 and 42 weeks from the first day of their mom’s LMP and only a small percentage of women actually deliver on their due date.

Another common term you'll hear throughout your pregnancy is trimester. A pregnancy is divided into trimesters:

  • the first trimester is from week 1 to the end of week 12
  • the second trimester is from week 13 to the end of week 26
  • the third trimester is from week 27 to the end of the pregnancy

Getting Started

To get started, simply click below on the week of pregnancy you'd like to view. Many of the articles include links to other pregnancy and newborn articles with more information.

Check back every week of your pregnancy to see how your baby is developing and to find out what changes you can expect in your own body, too!

Click on each week
Week1Week 2Week 3Week 4Week 5Week 6Week 7Week 8Week 9Week 10 Week 11Week 12Week 13Week 14Week 15Week 16Week 17Week 18Week 19Week 19 Week 21Week 22Week 23Week 24Week 25Week 26Week 27Week 28Week 29Week 30 Week 31Week 32Week 33Week 34Week 35Week 36Week 37Week 38Week 39Week 40

Reviewed by: Elana Pearl Ben-Joseph, MD
Date reviewed: June 2008

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