Most girls get their first period between the ages of 9 and 16. Most means the majority - not everyone will fall into this category. Anyway, it follows the development of breasts, hips, waist, pubic hair, and a growth spurt. Put those clues together and they usually add up to imminent period alert. In addition, a girl will often weigh at least 100 pounds before menstruation begins. Genetics also plays a role. If possible, find out when your mom got her first period to get an estimate of when yours may arrive.
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