13 Weeks

Our baby is growing rapidly; its growth is particularly noticeable from now through about 24 weeks. The baby has doubled in length since the 7th week, measuring at 2½ to 3 inches long (6.5-7.8cm) and weighing at about ½ and ¾ oz (13-20g) roughly the size of a peach. Changes in the fetal weight have also been tremendous during the last 8-10 weeks of pregnancy. One interesting change is the slowdown in growth of baby's head compared to the rest of the body. By week 21 the head is about one third of the baby's body and at birth baby's head is only ¼ the size of its body. Baby's body accelerates in growth as the fetal head slows down in growth. Baby's face is more human like now; eyes that started out at the sides are now closer together on the face. External genitalia have developed enough so a male can be distinguished from a female baby. Our baby's vocal cords have begun to form. Our baby's hand is structurally complete and consists of 27 bones held together by a complex network of ligaments. Similarly baby's foot is also completely formed with the toes, heel and bones all in place.