Search

close   X

kidshealth library

health & safety topics

Your child's health and safety is our top priority. Please search our resource library for information on health, nutrition, fitness, injury prevention and other important topics.

Pregnancy

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.

Week 16

Your baby can hold his or her head erect, and facial muscles now allow for a variety of expressions, such as squinting and frowning.

Week 17

Your baby is still very tiny at about 5.1 inches from crown to rump this week.

Week 18

Your baby's bones had been developing but were still soft. This week, they begin to harden, or ossify.