FH-ADO-002 · ages 9-15

When Should My First Period Start - and What Is Normal?

Growing Body & Preventive Health

If something feels unsafe or urgent

You can always get help, whatever your age, without an account.

Most first periods come between 10 and 15, usually about two years after your breasts start growing. Early ones are often irregular and that is expected.

What's happening

Your first period (menarche) means your body has started its monthly cycle. In the first year or two the cycle is still settling, so periods can skip a month, come early, or be light one time and heavier the next.

Usually normal

Bleeding for 2 to 7 days
Cycles anywhere from 21 to 45 days apart in the first years
Brown or dark blood at the start or end
Cramps, sore breasts and mood changes in the days before

Get checked if

No period by age 16, or no period 3 years after breasts started
Bleeding so heavy you soak a pad every hour
Periods that stop for more than 3 months after they were regular
Any bleeding before age 9

Your next step

Pack a period kit — pads, a spare panty, painkillers — and start logging your start date each month so you can see your own pattern.

Printable packs

My 10-19 Health and Independence Timeline
Organised Me: Weekly Health, School and Life Planner