Head to rump, your baby is about 5 1/2 inches long (about the length of a bell pepper) 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.
And from another source:
One of a kind. This week, your little one is developing one of the characteristics that will make her unique: fingerprints. Pads of fat accumulating on the fingertips and toes will turn into distinguishing swirling lines.
Prepping the plumbing. "What happens when this stuff goes down into my stomach?" The large intestine has been tacked down to the back of the abdominal wall, and many digestive glands are forming. This developing digestive system has been going through its paces for several weeks already: The fetus is swallowing amniotic fluid, which then makes its way through the stomach and intestines. Now, that fluid combines with dead cells and secretions in the intestines to form meconium. Meconium is the black, tarry substance that will eventually make up your baby's first messy diaper.
Measuring up. The fetus weighs up to 7 ounces and is about 6.5 to 7 inches, top to bottom.
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