17 weeks

Your Baby: If you hold out the palm of your hand, your baby could sit in the center! Your baby weighs 5 ounces now (about as much as a turnip), and she's around 5 inches long from head to bottom. Your baby is growing a little more every day. This week, your baby begins to develop fat cells (also known as adipose tissue). As your baby grows, these fat cells are essential to maintaining heat production and body temperature. Right now, water makes up most of your baby�s body, but by the end of your pregnancy, more than three-quarters of his or her birth weight will be fat. Your baby's skeleton is changing from soft cartilage to bone, and the umbilical cord — her lifeline to the placenta — is growing stronger and thicker. She can move her joints, and her sweat glands are starting to develop.