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Through sexual intercourse. A man puts his penis inside a woman's vagina and thrusts it in and out until a fluid called semen comes out of his penis. The semen is filled with sperm. If one of the sperm cells finds the woman's egg cell, inside her vagina (one egg cell is released every month from the ovaries), and the sperm cell penetrates the egg cell and fertilizes it, then the cell starts developing into a baby.

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15y ago

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