A member asked:

How often does a teen girl have irregular periods?

A doctor has provided 1 answer

Frequently at first: Irregular menstrual cycles are extremely common in newly menstruating teen girls ages 11-14. Around 14 to 15 years of age mother nature has the "ovulation factory" figured out and can consistently turn out a "new egg vehicle" monthly which regulates the periods if not on hormonal contraception.

Answered 5/4/2012

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Does a girl have unbalanced hormones if irregular periods?

3 doctors weighed in across 2 answers