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Girls get periods to prepare their bodies to have a baby when they are older. The blood comes from inside the uterus, in which the wall of the uterus sheds a fluid containing blood that isn't needed. It is needed when you get pregnant. That's why you miss periods if you are pregnant.

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15y ago

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Girls have monthly periods as part of their menstrual cycle. This cycle prepares the body for pregnancy by shedding the uterine lining if fertilization does not occur. Hormonal changes trigger the shedding of the lining which results in menstrual bleeding.

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9mo ago
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Q: Why do girls have monthly periods?
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