3 doctors weighed in:

What causes irregular menstrual periods in young girls?

3 doctors weighed in
Dr. Carolyn Thompson
Obstetrics & Gynecology
2 doctors agree

In brief: Depends on age

It may take up to 18 months after the first period for menstruation to become regular. In order for a girl or woman to have a period, a complex series of hormone signals has to take place.
It can take the body time to get all of those signals "in sync, " so it may be many months before the period becomes regular.

In brief: Depends on age

It may take up to 18 months after the first period for menstruation to become regular. In order for a girl or woman to have a period, a complex series of hormone signals has to take place.
It can take the body time to get all of those signals "in sync, " so it may be many months before the period becomes regular.
Dr. Carolyn Thompson
Dr. Carolyn Thompson
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