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