In short

Girls usually start their first period between the ages of 10 and 15, with signs like breast development, discharge, and growth changes appearing beforehand. 

A first period often lasts 2 to 7 days and may be light or irregular at first. It can take time for cycles to settle into a pattern.

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Period tracking & more for teens. Guidance for parents.

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When do girls usually get their first period?

Most girls start their first period between 10 and 15 years old, although it can happen earlier or later. This is a normal part of puberty and varies from person to person.

It’s completely understandable to wonder if your daughter is “on time.” According to the NHS, the most common age to start periods is 12, but there’s a wide range of normal.

A few factors can influence timing:

• Genetics
• Body development and overall health
• Nutrition and lifestyle

If your daughter hasn’t started her period by around 15, it may be worth checking in with a doctor. 

What are the signs my daughter is starting her first period?

There are usually clear physical signs that your daughter’s first period is approaching, often starting months or even a couple of years beforehand.

By looking out for signs, you can help your daughter prepare for her period so she feels less overwhelmed when it does arrive.

Common signs include:

• Breast development: often the first sign of puberty
• Growth spurts: getting taller quickly over a short time
• Body hair: underarms and pubic area
• Vaginal discharge: a clear or white fluid, which can appear 6–12 months before a period starts
• Mild cramping or mood changes: some girls notice early hormonal shifts

These signs don’t mean her period will start immediately, but they do show her body is preparing.

How long will my daughter’s first period last?

A first period usually lasts between 2 and 7 days, though it’s often lighter and less predictable than later periods.

It’s normal to feel unsure about what’s “typical” here. Early periods can be quite different from what you might expect.

You might notice:

• Light spotting rather than a steady flow
• Brown or darker blood (which is normal)
• Shorter or slightly longer duration

The body is still adjusting, so it may take a few cycles before things feel more consistent. 

FAQs

Is it normal for my daughter’s periods to be irregular at first?

Yes, irregular periods are common in the first year or two after they start. This is because ovulation (when an egg is released) doesn’t always happen regularly at first.

How do I know my daughter’s first period is coming soon?

Signs like vaginal discharge, breast development, and growth changes often appear months before a first period.

What should my daughter do when her first period starts?

Having access to pads and knowing the basics can help her feel prepared. Many teens prefer simple, low-effort options to start with.

Is it normal for a first period to be very light?

Yes, first periods are often lighter and may look like spotting rather than a full flow.

What should I do next?

If your daughter is approaching her first period, a bit of preparation can make things feel much less overwhelming. You may want to check out luna's article on first period dos and dont’s so you can help your teen navigate this big change. You may also want to learn about teen period products so you can offer your daughter options. 

Alongside your support, having clear, age-appropriate information can really help her feel more confident. On luna, your daughter can learn what to expect, understand the signs of her cycle, and track her period so it feels less unpredictable when it starts.

Rated 4.8

Period tracking & more for teens. Guidance for parents.

Find out more