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Your Developing Baby, Week by Week

Your baby begins as a tiny cluster of cells, but during the nine-month process of pregnancy she becomes an amazing baby with facial features, a beating heart and kicking legs. Find out what's happening with baby's development week by week.
week 17 Week 17

Finally, your baby's arms, legs, and trunk have caught up to the size of his head. Baby starts plumping up this week, as body fat is deposited under his skin and sweat glands develop. Also worth noting: The placenta is almost as big as your baby. It provides vitamins, minerals, proteins, fats, and oxygen, along with removing waste and filtering carbon dioxide.