18 weeks:

-Head to rump, your baby is about 5 1/2 inches long
-his ears are now in their final position, although they're still standing out from his head a bit.
-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.

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