Hi, I’m Blossom!
Am I puberty ready?
A friendly quiz to help you understand where you are in puberty, what changes are typical, and what to expect next. There are no right or wrong answers about your body!
- 17 quick questions
- About 5 minutes
- Grow your garden as you go
This quiz provides educational information only. Puberty progresses differently for everyone and cannot be diagnosed through an online assessment. Your answers stay on this device. Nothing is stored.
Puberty can feel confusing. One week you notice a small, sore bump under your shirt. The next week, a friend already has her period, and nothing has happened for you yet.
Here is the short version. Most girls in the United States start puberty between ages 8 and 13. A small change in the breasts is usually the first sign.1 A first period usually comes two to three years later, often around age 12.2 This guide covers what is normal and what to do when a first period shows up.
On this page
Key takeaways
- Puberty usually starts between ages 8 and 13. Breast buds are often the first sign.
- A first period usually comes two to three years after that, often around age 12.
- Periods are often uneven for the first year or two. That is normal.
- Change a pad every 3 to 4 hours, and a tampon every 4 to 8 hours, never longer than 8.
- See a doctor or nurse if there is no breast growth by 13, no period by 15, or a period before age 8.
- A small period kit, packed ahead of time, makes a first period much less stressful.
What is puberty?
Puberty is when hormones (chemicals made by the brain and ovaries) cause the breasts to grow, the body to get taller, new hair to grow, and a first period to start.1 It happens slowly over a few years, and it looks a little different for every girl.
The signs usually show up in this order
| Sign | When it usually happens |
| Breast buds | Ages 8 to 13, usually the first sign1 |
| Growth spurt | Often the year before a first period |
| Underarm and pubic hair | Follows breast changes for most girls |
| Vaginal discharge | A few months to a year before a first period |
| Acne and mood changes | On and off during puberty |
| First period | Usually 2 to 3 years after breast buds start2 |
What a first period is usually like
A first period is often just a few spots of light red or brown blood, not a heavy flow. Once periods start, a normal cycle lasts 21 to 45 days. It usually settles toward the adult range of 24 to 38 days after two to three years, and bleeding usually lasts 7 days or less.3 Periods are often uneven for the first year or two while hormones settle into a pattern. That is normal, not a sign anything is wrong.
Mood swings and emotional changes
Puberty changes feelings, not just the body. Mood swings, shyness, and mixed feelings about growing up are all normal. Some girls feel excited and curious. Others feel nervous or unsure, and that is okay too. Talking to a parent, a school nurse, an older sister, or a doctor helps. They answer questions like these every day, so no question is too small.
Building a period kit
A small kit in a backpack or school locker helps a lot. A simple kit can have:
- 2 to 3 pads, or thin pads and pantyliners if a period has not started yet
- A spare pair of underwear, or period underwear
- A small zip pouch to keep it together
- A menstrual cup or tampon for swimming
- Wet wipes or tissues
- A small bag to dispose of used pads
Change a pad every 3 to 4 hours, or sooner if it feels full. Change a tampon every 4 to 8 hours, and never longer than 8 hours, since wearing one too long raises the risk of a rare infection called toxic shock syndrome (TSS). Warning signs include sudden high fever, rash that looks like sunburn, vomiting or diarrhea, dizziness, or fainting.4 Remove the tampon and seek care immediately if these occur.
If a first period starts today
- Take a breath. It is almost never an emergency.
- Get a pad. From a kit, a school nurse, teacher, or friend. Folded toilet paper works for a few minutes.
- Stick it in place. Sticky side down, in the underwear.
- Change it every 3 to 4 hours, or sooner if it feels full.
- Tell a trusted adult when possible, like a parent, nurse, or teacher.
For cramps, a warm water bottle, gentle stretching, or a warm shower can help. Mild cramps are a normal part of the period.
When puberty starts very early or very late
Starting puberty a little early or late is usually just normal, not a medical problem. Puberty before age 8 is called precocious puberty, which just means early puberty. A doctor usually checks it, even though most cases are simply a normal process starting sooner.5
A doctor also checks in if there is no breast growth by 13, or no period by 15. This pattern is called delayed puberty, or late puberty, and needs a doctor’s attention.5
When to see a doctor?
Tell a trusted adult and see a doctor or nurse if any of the following happen:
- No breast development by age 13
- No period by age 15, or more than 3 years after breasts began developing
- Periods are extremely heavy, soaking a pad or tampon every hour for several hours in a row
- Severe pelvic pain that stops normal activities
- Bleeding lasts longer than 7 days
- A period starts before age 8
- Regular periods suddenly stop for 3 months or more
Most of the time, everything is right on track. A quick check-in just confirms it.
Frequently asked questions
Maybe. A first period usually shows up about two to three years after the breasts start to grow, often around age 12. There is no way to know the exact day.
Ask a school nurse, teacher, or a friend for a pad. Folded toilet paper works for a little while until a real pad is available.
Yes. Puberty starts at a different age and moves at a different speed for every girl. Looking different from friends for a while is completely normal.
Mild cramps are common, especially in the first day or two. A warm water bottle or gentle stretching often helps. Very severe pain that stops normal activities should be checked by a doctor.
Yes. Exercise and swimming are both safe during a period, and moving around can even help with cramps. For swimming, a tampon works better than a pad, since pads should not be worn in water.
Change a pad every 3 to 4 hours, or sooner if it feels full. Change a tampon every 4 to 8 hours, and never longer than 8 hours.
That is okay. Puberty starts anywhere between ages 8 and 13, so starting a little later is still completely normal.
A couple of pads or pantyliners, a spare pair of underwear, some wipes or tissues, and a small bag for disposing of used products.
Last medically reviewed on
References
Our commitment to accuracy is paramount; we use high-quality sources, including peer-reviewed studies, to support the facts in our articles. Learn more about our Editorial Process.
- American College of Obstetricians and Gynecologists. (n.d.). Your changing body: Puberty in girls. acog.org
- American College of Obstetricians and Gynecologists. (2026). Your first period. acog.org
- American College of Obstetricians and Gynecologists. (2015). Menstruation in girls and adolescents: Using the menstrual cycle as a vital sign (Committee Opinion No. 651). acog.org
- U.S. Food and Drug Administration. (2024). The facts on tampons, and how to use them safely. fda.gov
- Eunice Kennedy Shriver National Institute of Child Health and Human Development. (2021). About puberty and precocious puberty. nichd.nih.gov