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Parentpedia
Hair
Will your baby have your thick, dark curls or your husband's wispy carrot top? It's hard to say what kind of locks she'll have until months after birth. In fact, your baby's hair will change more often than Ashlee Simpson's.
First Trimester
Your baby starts developing eyebrows and peach fuzz on the scalp. By Week 16, the patterning of hair (including cowlicks) has begun. Dark-haired babies' follicles will begin to make pigment. Around this same time, another type of hair, called lanugo (or fetus fur), begins to cover the body.
Second Trimester
The eyebrows are fully formed and the scalp hair continues to grow. By Week 25, you could tell its color and texture if you had a window into your womb.
Third Trimester
Eyelashes become noticeable. Hair on the scalp can be anywhere from 1/2 to 1 1/2 inches long. The lanugo starts to shed around week 30. Sometimes, the lanugo lingers after birth, but put away the wax. It will fall out soon.
Some babies are born with almost no hair and others look like they need a haircut. (A 2006 study by Johns Hopkins University found a relationship between heartburn in pregnant women and the amount of hair their newborns had.) Newborn hair will fall out after a couple months and may not look like the mane that will grow in its place.
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