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There are millions of sperm produced by your testes (testicles) everyday. Sperm cells undergo the natural cell division which inevitably leads to its maturation. Half of the sperm carries a Y chromosome (inherited from your dad) and an X chromosome (inherited from your mom). If a Y-carrying sperm fertilizes the woman’s egg, the result is a baby girl. If on the other hand, it’s the X-carrying sperm which fertilized the egg, then it’s a baby boy.