The first menstruation (menarche) is the most definitive sign of puberty in females. It occurs at an average age of 13 years in the Northern Hemisphere, with 95% of females reaching menarche between ages 11 and 15. In the United States, menarche occurs at an average age of 12.3 years.
A girl's first menstruation is called menarche. This is pronounced MEN-arc or MEN-arc-y. When a girl passes certain milestones in her development, but does not start having periods, this is called Primary Amenorrhea.
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Answer:
The first menstruation (menarche) is the most definitive sign of puberty in females. It occurs at an average age of 13 years in the Northern Hemisphere, with 95% of females reaching menarche between ages 11 and 15. In the United States, menarche occurs at an average age of 12.3 years.
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Answer:
A girl's first menstruation is called menarche. This is pronounced MEN-arc or MEN-arc-y. When a girl passes certain milestones in her development, but does not start having periods, this is called Primary Amenorrhea.