A baby in the first trimester at 12 weeks has the following features: Muscles and nerves are coordinated. Baby can make a fist. The baby’s eyelids are closed and will not open until 28 weeks’ gestation. The growth of the head is slower and the baby has grown longer. Your baby weighs nearly one ounce and is about 3 inches long.
The baby’s eyelids are closed and will not open until 28 weeks’ gestation. The growth of the head is slower and the baby has grown longer. Your baby weighs nearly one ounce and is about 3 inches long. The external sex organs show the baby’s gender, but this is not distinguishable on ultrasound until the second trimester or later.
This photo shows a baby at 16 weeks of gestation during the second trimester of pregnancy. At this stage: Tissues including bones and muscles continue to form. The baby begins to develop translucent skin. The baby begins to form a substance called meconium, which is the first bowel movement. The baby displays a sucking reflex with the mouth.