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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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โˆ™ 2009-09-21 22:07:07
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Q: Why do girls have monthly periods?
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