Embryology: As the fertilized egg develops there's a time where the fetus is neither male or female. Then genetics kicks in and the right hormones grow the proper gender. This is why some males during teens get small breast buds - slight female tissue left over. Simplistic testicles in males - ovaries in females. It's fascinating we all turn out reasonably ok thru this complex process! https://en.wikipedia.org/wiki/Embryology
Answered 6/29/2016
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3 doctors weighed in across 2 answers
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