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A Week-by-Week Pregnancy Calendar

Our week-by-week illustrated pregnancy calendar is a detailed guide to all the changes taking place in your baby - and in you!

Pregnancy Slideshow (Baby)

This week‑by‑week pregnancy calendar shows you some of the important developments taking place as your baby grows.

Pregnancy Slideshow (Mom & Baby)

Here's a peek at what's going on inside your body during the amazing 40 weeks of pregnancy. Watch your belly — and your baby — grow!

Week 1

Week 1 is actually your menstrual period, but because your due date is calculated from the first day of your last period, it counts as part of your 40-week pregnancy.

Week 10

At this point in the pregnancy, all vital organs have been formed and are starting to work together. Congenital abnormalities are unlikely to develop after week 10.

Week 11

If you saw a picture of your baby now, you'd think you had a genius on your hands — the baby's head accounts for about half of the body length!

Week 12

Tiny fingernails and toenails start to form this week, which is the last of your first trimester.

Week 13

As you begin the second trimester, your baby may be able to put a thumb in his or her mouth although the sucking muscles aren't completely developed yet.

Week 14

Some fine hairs, called lanugo, have developed on your baby's face. This soft colorless hair protects the skin and will eventually cover most of your baby's body until it is shed just before delivery.

Week 15

Muscle development continues, and your baby is probably making lots of movements with his or her head, mouth, arms, wrists, hands, legs, and feet.