18 weeks

Head to rump, our baby is about 5 1/2 inches long (about the length of a bell pepper) and it weighs almost 7 ounces. It's busy flexing it's arms and legs — movements that I will start noticing more and more in the weeks ahead. The blood vessels are visible through the thin skin, and the baby's ears are now in their final position, although they're still standing out from it's head a bit. A protective covering of myelin is beginning to form around the nerves, a process that will continue for a year after it is born. If we're having a girl, her uterus and fallopian tubes are formed and in place. If we're having a boy, his genitals are noticeable now, but he may hide them from view during an ultrasound.