A guide to your tween's first period

Learn the signs a first period is coming, how to prepare a period kit, and when to see a GP. Blackmores' guide for parents and tweens in Australia.

In Australia, most girls get their first period around age 12 or 13, though it can arrive any time between age 9 and 16. For parents, this is often one of the first big conversations of the tween years. For children, it can feel exciting, nerve-wracking, curious, or all three at once. Having clear, calm information ahead of time helps take some of the mystery and worry out for everyone.

This guide walks through what a first period actually is, the physical signs that tend to come before it, how to prepare a practical period kit, what to expect during the first few cycles, and when it's a good idea to talk with a GP.

What is a first period?

A first period, medically known as menarche, is the first menstrual bleed a person has. It signals that the reproductive system is maturing and the menstrual cycle has begun.

The Royal Children's Hospital Melbourne explains that a period is when blood and the lining of the uterus leave the body through the vagina, usually happening about once a month. The average total blood loss per period sits somewhere between 20 and 90 millilitres, which often looks like more than it is.

For most young people, the first period is one of the later signs of puberty rather than one of the first. It usually turns up around two to three years after breasts begin to develop, according to Healthdirect Australia.

When do periods usually start?

There's a wide window of what's considered normal. The Raising Children Network, a service supported by the Australian Government, notes that periods most commonly begin between 11 and 14½ years, with anywhere from 10 to 16 considered typical. A few things influence timing such as:

• Family patterns and genetics
• Body weight, nutrition and general health
• Physical activity and stress levels
• Overall pace of pubertal development

There's no "right" age. A child whose period arrives at 10 is developing normally, and so is one whose period arrives at 15. If puberty hasn't started by age 13, or if there's still been no first period by age 15 or 16, that's a good moment to book in with a GP for a check.

Signs a first period may be coming

The body usually gives some signals in the months leading up to the first period. Recognising these can help both parent and child feel prepared. According to the Raising Children Network, periods are likely to start soon if a child has:

• Developed breasts, which is often the earliest visible sign of puberty
• Grown most of their pubic hair, with new hair also appearing under the arms
• Had a recent major growth spurt
• Noticed new or extra vaginal discharge on their underwear

The vaginal discharge sign is worth mentioning specifically. It tends to appear in the months leading up to the first period and is a helpful heads-up that periods may be around the corner. It's completely normal, and some children like to wear a panty liner or period underwear to feel more comfortable.

Emotional shifts are also part of the picture. Hormonal changes during puberty can bring more sensitivity, moodiness or self-consciousness, all of which are typical of this stage of development.

How to prepare a first period kit

A first period kit is a small bag your child can keep in their school backpack, sports bag, or bedside drawer for when the first bleed arrives (or for future periods once they've started). The idea is simple: they never have to be caught off guard.

A useful kit usually includes:

• A few sanitary pads in a couple of absorbencies (regular and overnight)
• A pair of period-proof underwear as a backup
• A small zip lock bag for used products
• A packet of wipes or a small pack of tissues
• A spare pair of underwear
• A dark-coloured jumper or long shirt to tie around the waist if needed

Jean Hailes for Women's Health suggests looking for pad brands that include clear diagrams and simple instructions, since this may be the first time your child has used a period product. Opening a pad at home together, so they can see how the wings fold and where the sticky side goes, is often more useful than a spoken explanation alone.

Tampons and menstrual cups are safe to use at any age when used according to instructions, but they usually take time and practice, so pads or period underwear are the easiest starting point.

What is normal during the first few cycles?

The first few cycles are often quite different to what settled cycles look like later. This is because the hormones that control the menstrual cycle are still finding their rhythm.

How long cycles are in the early years

Healthdirect notes that irregular periods are normal in the first three years after menarche. Periods might arrive close together one month, then skip a month or two, then return again. The Raising Children Network explains that in these early years, cycles can range from as short as 21 days to 45 days or longer, and about two years after the first period, cycles usually settle into a more predictable 25 to 35 day pattern.

What normal bleeding looks like

Other things that are normal during the first few cycles, according to the Royal Children's Hospital:

• Length: bleeding usually lasts between 2 and 7 days
• Colour: blood can vary from bright red to darker red, all normal
• Flow: heavier on days 1 and 2, tapering off toward the end
• Consistency: some days may include small clots, which is also normal

Tracking periods to spot patterns

Tracking periods with a calendar, diary or period-tracking app can help your child begin to notice their own patterns. This makes it easier to plan around swimming carnivals, sleepovers or school camps as cycles become more regular.

Period pain, mood changes and other early symptoms

Common physical symptoms

Mild to moderate cramps are common, especially in the first day or two of a period. The Royal Children's Hospital describes them as a dull ache or throbbing in the lower abdomen, back or thighs. Cramps happen because the uterus tightens to help release its lining.

Other physical symptoms that can come and go around period time include:

• Bloating and tender breasts
• Headaches
• Fatigue
• Skin changes such as pimples
• Digestive changes

Emotional changes

Emotional symptoms often show up in the days leading up to a period. Feeling more sensitive, tearful, irritable or low is common as hormone levels shift. The Raising Children Network notes that giving your child a little more privacy and space around this time can make things easier for everyone.

What helps with period discomfort

Simple things that often help with period discomfort include a heat pack on the lower stomach, gentle movement like walking, rest with legs elevated, and warm drinks. If pain relief medication is being considered, a pharmacist or GP can advise on suitable options and dosing for your child's age.

If period pain regularly stops your child from going to school, playing sport or getting out of bed, that's a signal to talk with a GP rather than something to push through.

How parents can support confidence and reduce embarrassment

How the first period is talked about at home has a lasting impact on how your child feels about their body and their cycle. Jean Hailes highlights that tone matters as much as the words themselves, and that calm, matter-of-fact language helps normalise what's happening.

A few things that support confidence:

• Start early: beginning conversations before periods happen, noting that periods can start as early as age 9 and children often start asking questions before then.
• Use correct words: uterus, vagina, period. Nicknames are fine too, as long as your child also knows the accurate names.
• Answer, then pause: let your child lead the conversation with their questions rather than delivering a full lecture.
• Reassure without minimising: "Your body is doing exactly what it's supposed to do" acknowledges the change without brushing off any nerves.
• Keep the door open: "You can always come back and ask me more, even weeks or months from now" invites future conversations.

If your child would rather talk to a different trusted adult, that's okay too. Some kids feel more comfortable talking with an older sibling, aunt, grandparent, school nurse or their GP. What matters is that they have someone.

Practical involvement also builds confidence. Shopping for period products together, letting your child choose the brand or style they like, and even celebrating with a small treat can help mark the moment in a positive way.

Period hygiene basics for tweens

Good period hygiene is straightforward once your child knows the basics:

• Change products regularly. Pads and tampons should be changed every 4 to 8 hours, more often on heavier days. Tampons must be changed at least every 8 hours to reduce the small risk of Toxic Shock Syndrome (TSS), a rare but serious bacterial infection. Menstrual cups can be worn for up to 12 hours before rinsing.
• Wash hands before and after changing products
• Dispose of pads and tampons in bins, not toilets, wrapped in toilet paper or in the wrapper of the next pad
• Gently wash the vulva daily with warm water; strong soaps or scented products aren't needed and can cause irritation
• Change out of damp swimwear or sports clothes promptly

Period underwear and menstrual cups need to be washed and cared for according to the packet instructions. Reusable options can be more comfortable and are gentler on the environment over time, though they may take a little practice to get used to.

Leaks happen to everyone at some point. Keeping a spare pair of underwear and a dark-coloured jumper in the school bag means an accident is a minor detour rather than a big deal.

When to speak to a healthcare professional

Most first periods and early cycles are completely normal and don't need medical attention. There are a few situations, though, where a GP visit is a good idea. According to guidance from Healthdirect and the Royal Children's Hospital, consider speaking with a doctor if your child:

• Hasn't started puberty by age 13
• Hasn't had a first period by age 15 or 16
• Has periods that regularly last longer than 7 days
• Has periods more than 3 months apart
• Experiences period pain so severe they can't go to school or get out of bed
• Has bleeding that seems very heavy or that soaks through period products very quickly
• Notices sudden changes to previously regular cycles
• Has any other symptoms that are worrying them or you

A GP can help work out what's normal for your child, offer reassurance, or investigate further if needed. If your child feels more comfortable, they can ask to see a female GP.

Frequently asked questions

What age do girls usually get their first period in Australia?

Most girls get their first period between the ages of 11 and 14½, with the average around 12 to 13. Anywhere from 9 to 16 is considered within the normal range.

How long does a first period usually last?

A first period typically lasts between 2 and 7 days. Some first periods are very light and may only last a day or two, sometimes starting with a small amount of brown or dark discharge before any brighter red bleeding. Others start with a fuller flow from day one. Both are normal. Flow is usually heaviest on the first day or two, then tapers off toward the end.

Are irregular periods normal at first?

Yes. Healthdirect confirms that irregular periods are common in the first three years after menarche. Cycles may skip months, arrive closer together, or vary in flow while the body settles into a rhythm.

What should be in a first period kit?

A basic kit includes a few pads in different absorbencies, a small bag for used products, wipes or tissues, a spare pair of underwear, and something to tie around the waist if needed. Period underwear can also make a helpful backup.

How can parents help tweens feel prepared and confident?

Start conversations early, use accurate words, keep the tone calm and factual, and let your child ask questions at their own pace. Normalising periods well before the first one arrives is helpful so it feels like a familiar topic rather than a shock.

Where can my tween go for confidential support?

Kids Helpline provides free, confidential phone and online counselling for young people aged 5 to 25 on 1800 55 1800, 24 hours a day. It's a good option if your child would like to talk to someone outside the family.

Key takeaways for parents and tweens

First periods are a normal and healthy milestone. Most arrive between the ages of 11 and 14½, though anywhere from 9 to 16 is within the typical range. The body usually gives a few signs in advance, including breast development, pubic hair, a growth spurt and vaginal discharge.

The first few years of periods often bring irregular cycles, varied flow, cramps and mood changes, all of which are common as the body finds its rhythm. Small preparations like a first period kit, a shared knowledge base and open conversations at home make a real difference to how confident and calm a child feels.

Most of what happens during the early years of menstruating is completely normal. A GP is a good port of call for anything that feels off, disrupts everyday life, or falls outside the typical timeline. And whatever a child's experience of their first period, the most powerful support is often the simplest: someone calm, and willing to answer questions as they come up.

For more women's health information at every life stage, visit our Blackmores Women's Health hub.

Disclaimer: This article provides general information only and is not intended to diagnose, treat, cure, or prevent any disease. The information presented is not a substitute for professional medical advice. If you have concerns about your health, please consult your GP or healthcare provider for a personalised assessment and recommendations. Supplements should not replace a balanced diet.