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When a woman and a man are sexually active, the man inserts his penis into the woman's vagina, then his sperm will come out. His sperm will then travel to the woman's eggs and may "fertilize" one of them. That "fertilized" egg will move into the womb and grow into a fetus, or unborn baby. After about 9 months of pregnancy, the woman will give birth to the baby.

Sometimes more than one egg is fertilized, or the fertilized egg may divide before it goes to the womb. This results in multiple births : twins, triplets, or possibly more.

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13y ago

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