Fetal Development Weeks 9 Through 13

Week 12

By this week, your baby is, on average, about two-and-a-half inches long (keep in mind that, after week 11, growth rates can vary a lot), and could be cradled snugly in a soup spoon. Her brain's basic structure is now in place, and brain mass is growing all the time.

Several important digestive functions begin around this week. The pancreas begins to produce insulin, a hormone that regulates blood sugar levels. The liver starts to secrete bile, a thick greenish fluid stored in the gall bladder that helps the body digest fats.

Though still not quite "cute," the fetus is starting to look more like a person now. The bridge of the nose and the jawbones are starting to create the familiar outlines of a human face. Inside the mouth, folded tissues come together to make the palate, or roof of the mouth. Fingernails emerge from their nail beds. These nails can grow quite long; more than a few babies are born needing a quick manicure.

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