Puberty for girls usually starts somewhere between ages 8 and 13 and brings a whole series of changes over the next few years. Some are easy to see, some you mainly feel, and all of them are a normal part of growing up. Here is what each change is, why it happens and what you can do to feel comfortable.
Key takeaways
- Most girls start puberty between 8 and 13, and the first sign is usually breast buds.
- Changes happen gradually, typically over 2 to 5 years, in a fairly predictable order.
- The first period usually comes 2 to 3 years after breasts begin to develop, often around age 12.
- Discharge, acne, body odor and mood swings are all common and normal.
- Every body develops on its own schedule, so there is no need to compare.
What starts puberty
Puberty begins when your brain signals your ovaries to make more of the hormone estrogen. Estrogen drives most of the changes below. Other hormones from the adrenal glands add to things like oily skin, body odor and some hair growth.
Breast development
Breast changes are usually the first visible sign of puberty.
- It begins with breast buds: small, firm lumps under the nipple. They can feel tender or itchy, and that is normal.
- Over the next few years, breasts slowly grow and change shape. The area around the nipple (the areola) may get larger and darker.
- It is very common for one side to develop faster than the other.
- Breasts come in many sizes and shapes, mostly decided by genetics.
A soft crop top or first bra can make you more comfortable, especially during sports, whenever you feel ready.
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Ask anonymouslyGrowth spurt and body shape
Girls usually have their fastest growth early in puberty, often between ages 10 and 12, before their first period.
During this time you might:
- Grow several centimeters in a year
- Notice your hands and feet grow first, before the rest of you
- See your hips get wider and your body shape become curvier
- Gain weight, which is a healthy and necessary part of development
Gaining some body fat around the hips, thighs and upper arms is normal and needed for healthy hormone levels and periods. It is not a sign that anything is wrong.
Body hair
Hair growth happens in several places:
- Pubic hair begins as a small amount of fine hair and gradually becomes darker, coarser and curlier.
- Underarm hair usually appears a year or two later.
- Leg and arm hair may get darker or thicker.
Whether you remove body hair is entirely your personal choice. Hair has no effect on health either way.
Vaginal discharge
Many girls notice a clear or whitish fluid in their underwear several months before their first period. This is vaginal discharge, and it is a healthy sign that your body is working as it should.
Normal discharge:
- Is clear, white or slightly yellowish when it dries
- Has little or a mild smell
- Can change in amount and texture over the month
Panty liners can help if you want to keep underwear fresh.
Your first period
A period (menstruation) is when blood and tissue from the lining of the uterus leave the body through the vagina. It is a sign that the reproductive system is maturing.
| Fact | Typical range |
|---|---|
| Age at first period | About 10 to 15, average around 12 |
| Time after breast buds | About 2 to 3 years |
| Length of a period | About 2 to 7 days |
| Time between periods | About 21 to 45 days in the first years |
Periods are often irregular for the first year or two. Skipping a month or having cycles of different lengths is common at first.
Some girls get cramps, tiredness, bloating or mood changes just before or during a period. Gentle exercise, a warm heat pad and, with a parent's okay, over-the-counter pain relief can help.
Skin, sweat and hygiene
Rising hormones make oil and sweat glands more active.
- Acne is very common. Washing your face gently twice a day and avoiding picking at spots helps.
- Sweat and body odor increase, especially under the arms. A daily shower and deodorant usually take care of it.
- Hair may get oilier, so you may want to wash it more often.
If acne is painful or affecting your confidence, a doctor can recommend effective treatments.
Feelings and emotions
Changing hormones, a developing brain and new social situations can all affect how you feel.
You might notice:
- Mood swings or feeling more emotional than usual
- Feeling self-conscious about your body
- Wanting more privacy
- Stronger opinions and more interest in independence
These feelings are part of growing up. Sleep, movement, good food and talking to someone you trust can make a real difference.
When to talk to a doctor
Check in with a doctor if:
- Breasts or pubic hair start developing before age 8.
- There are no signs of breast development by age 13.
- You haven't had a period by age 15, or more than 3 years after breasts started growing.
- Periods last longer than 7 days, are very heavy (soaking a pad every hour or two), or come closer than 21 days apart.
- Period pain stops you from going to school or doing normal activities.
- Discharge is green or gray, smells strong, or comes with itching or burning.
- Your mood feels low or anxious most days for two weeks or more.
The bottom line
Puberty for girls is a gradual journey that includes breast growth, a growth spurt, new hair, discharge and eventually periods. It may feel like a lot, but each change is a normal sign of a healthy, developing body. Go at your own pace, take care of yourself and ask questions whenever something feels unclear.
Frequently asked questions
What is usually the first sign of puberty in girls?
For most girls, the first sign is breast buds, which are small, firm, sometimes tender bumps under one or both nipples. This usually happens between ages 8 and 13.
Is it normal for one breast to grow faster than the other?
Yes, very normal. One side often starts or grows faster, and the difference usually becomes less noticeable by the end of puberty, although slight differences in adults are common too.
What is the white or clear fluid in my underwear?
That is vaginal discharge, a normal fluid that helps keep the vagina clean and healthy. It often starts 6 to 12 months before a first period.
When will I stop growing?
Most girls grow the fastest before their first period and reach close to their adult height within about 2 years after it.
Sources & further reading
This guide was written in line with public guidance from the organizations below. It is reviewed regularly; spot an error? Tell us and we'll correct it.
- American Academy of Pediatrics (HealthyChildren.org) — healthychildren.org
- NHS — nhs.uk
- Nemours KidsHealth — kidshealth.org
- American College of Obstetricians and Gynecologists — acog.org
This article is general education, not medical advice. If you're worried about your health or your child's, talk to a doctor or nurse.