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A Description of the Various Stages of Prenatal Development Through intercourse sperm is released into the woman’s vagina, then swims through the opening of her uterus and out through her fallopian tubes. This can take about five minutes to pass through the uterus and reach the tubes and then an additional 15 minutes to pass through the tubes and reach the ovaries. The egg breaks out of the shell of her ovary and is penetrated by the head of one sperm. Immediately the ovum creates a chemical or electrical charge to preventing other sperm from entering. The story of a baby's life begins when a sperm fertilizes an egg. Within half an hour, the fertilized egg begins dividing at a fast rate while traveling down the fallopian tube to the uterus. The bunch of cells then implants itself into the wall of the uterus, where it wi