1st trimester: Week 12

The rib cage and eyelids begin to close to protect the heart and eyes.

Your Baby

You're reaching an important milestone--the end of the first trimester. Your baby now weighs about half an ounce and is about 2 1/2 inches long from top to bottom. He can open his mouth and wiggle his fingers and toes, upon which tiny nails have begun to grow. Brain development is in high gear, as fetal nerve cells multiply rapidly and synapses start firing.

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Your Body

Your uterus has moved from the pelvic floor to the front of your abdomen, which -- fingers crossed -- may ease the pressure on your bladder, cutting down on bathroom breaks. A dark vertical line of pigmentation, called linea nigra, may appear on your belly. If so, don't worry! It will disappear soon after birth. 

Do's and Don'ts

Do fight fiery heartburn! Try skipping fatty, acidic, or spicy foods; eating small, frequent meals; and waiting a few hours after eating before lying down. You can also take antacids with calcium carbonate, such as Tums. 

Health

So much for that fabled glow: Dermatologists say the same hormones that may keep one expectant mom's complexion blemish-free can cause a bout of acne in another. If you're breaking out, use oil-free, noncomedogenic makeup to cover pimples.

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