The second trimester in pregnancy is from 13 weeks to 28 weeks. This is the time when your uterus changes from a pelvic organ to an abdominal organ and you are now showing outward signs of being pregnant. During this time your baby is forming the muscle, bones and skin. You will start to feel the baby start to move in this trimester.
Watch the March of Dimes Videos on the month-by-month growth of your baby:
Info on the 3rd Trimester.