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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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6mo ago

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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Q: Why do girls have monthly periods?
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Many girls do not have regular periods when they first start having periods. As long as you are having periods every two or three months, there is no real reason for concern at this time. If your periods are very heavy, or if not being able to predict them causes you problems, you may wish to see a doctor (gynecologist) to get help in regulating them.


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