Week 15
Your 13-week-old fetus now measures about 4.1 (10.4cm) to 4.5 inches (11.4cm) from crown to rump and weighs about 1.75 ounces (50g). Its body is covered by an ultrafine hair, called lanugo, which is usually shed by birth. Eyebrows and hair on the top of the head are beginning to grow. He may even be sucking his thumb by now. Bones are getting harder.
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