Menarche does not usually occur until a girl weighs 100 pounds.

Name: Menarche does not usually occur until a girl weighs 100 pounds.
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Menarche, the onset of menstruation, is typically triggered by a combination of factors including body weight, body fat percentage, and hormonal changes. While there is no specific weight threshold for menarche, it generally occurs when a girl reaches a certain level of body fat, which is typically around 100 pounds.

Menarche Does Not Usually Occur Until a Girl Weighs 100