A Week-by-Week Pregnancy Calendar

Congratulations! Pregnancy is an exciting time, 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!

Reviewed by: Elana Pearl Ben-Joseph, MD
Date reviewed: January 2012

Related Resources

Maternal and Child Health Bureau This U.S. government agency is charged with promoting and improving the health of mothers and children.

American Academy of Pediatrics (AAP) The AAP is committed to the health and well-being of infants, adolescents, and young adults. The website offers news articles and tips on health for families.

American College of Obstetricians and Gynecologists (ACOG) This site offers information on numerous health issues. The women's health section includes readings on pregnancy, labor, delivery, postpartum care, breast health, menopause, contraception, and more.

A Guide for First-Time Parents If you're a first-time parent, put your fears aside and get the basics in this guide about burping, bathing, bonding, and other baby-care concerns.

Pregnancy Myths and Tales Even in these times, pregnancy continues to inspire its own set of myths and tales. Which are true and which aren't?

Becoming a Father Pregnant women experience a variety of emotions and life changes. But most first-time dads have lots of feelings and concerns to deal with, too.

10 Things That Might Surprise You About Being Pregnant Despite all the books, magazines, and pamphlets devoted to the topic of pregnancy, this 9-month period can take any soon-to-be parent by surprise.

Staying Healthy During Pregnancy During your pregnancy, you'll probably get advice from everyone. But staying healthy depends on you - read about the many ways to keep you and your baby as healthy as possible.

Pregnancy & Newborn Center Advice and information for expectant and new parents.