Week 13

The babies weigh between approximately 13 and 20 grams (1/2 and 3/4 ounce) and are approximately 2 1/2 to 3 inches long (about the size of a peach). The placenta and baby are about the same weight now.The baby's intestines are migrating from the umbilical cord into his or her abdomen. The villi are also forming in the intestines, and these help in peristaltic movements and digestion. The liver begins to secrete bile and the pancreas is even secreting insulin! All twenty teeth have formed and are waiting under the gums, while the babies have begun to practice swallowing by taking in the surrounding amniotic fluid and pass it back in their urine. The babies can smile and vocal cords are quickly developing, too. They look more and more human as eyes move closer together and the ears are beginning to move to what will be their normal positions.