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11 Weeks Pregnant: Your Baby’s Development

Meet the beat. Your little one's heart has been beating furiously for weeks, but it's only just become loud enough to hear. A fetus's heart beats twice as fast as yours, anywhere between 120 to 140 beats per minute. The heart has become a proper four-chambered structure over the past month, although some of the dividing walls won't be complete until after birth.

Skin is in. A fine layer of skin has been forming over the fetus's body during the past few weeks. A specialized layer starts to develop into what will become the fingernails and toenails.

Measuring up. Your little one's head is nearly half the length of the body, which shows you how rapidly your little genius is growing.

embryo Week 11

11 Weeks Pregnant: Your Symptoms

Must have it. Some experts think that cravings are your body's way of telling you what it needs. Others disagree. While no one really knows why cravings occur during pregnancy, there's no question that nearly every expectant woman has a yearning for particular foods at some point.

"C" baby grow. While you're pregnant, you need at least 85 milligrams of vitamin C every day. Vitamin C helps your fetus build new cells and develop healthy bones and teeth. Good food sources include oranges and other citrus fruits, papaya, strawberries, and broccoli. Pick up more tips on eating well during pregnancy.

The Rh test. During your pregnancy, you'll be tested for a protein called the Rh factor. If you test negative for Rh while the father is Rh-positive, the combination might make your child Rh-positive. This condition could have serious health consequences for your little one, as your body may make antibodies against the fetus's Rh-positive blood. To prevent this, you'll receive a shot of a substance called Rh immune globulin between your 28th and 29th weeks. You may also receive a shot after birth to protect future pregnancies.

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