Puberty: definition and meaning
Puberty is the stage of development when a child's body matures into an adult body capable of reproduction, driven by rising sex hormones. In girls it usually starts between ages 8 and 13 with breast budding, and the first period, called menarche, typically arrives about 2 to 3 years later, most often between 12 and 13.
Typical order of changes
- Breast buds appear, often on one side first
- Pubic and underarm hair grows
- A growth spurt, often the fastest growth since infancy
- Hips widen and body shape changes
- Vaginal discharge starts, a sign the first period is about 6 to 12 months away
- The first period
Periods in the first years
Early cycles are often irregular, because ovulation isn't happening every month yet. Cycles from 21 up to 45 days are normal in the first couple of years, and periods can skip. Most settle within 2 to 3 years. Read the full guide to periods and puberty and first period.
Puberty and mood
Rising hormones, a fast-changing body and big social changes arrive all at once. Mood swings, irritability and self-consciousness are common. Once periods start, some teens also notice PMS. Talking about it openly, and tracking how mood follows the cycle, can make it feel less scary.
See a doctor if breast development starts before age 8, if there are no signs of puberty by 13, no period by 15, or no period within 3 years of breasts starting to develop.
Frequently asked questions
What age do most girls get their first period?
Usually between 10 and 15, with an average around 12 to 13. See age of first period.
Is it normal for puberty to start at 8?
Yes, breast budding between 8 and 13 is within the normal range. Earlier than 8 is worth a doctor's check.
Sources
This page is for information only and isn鈥檛 medical advice. If something worries you, please talk to a doctor.
Keep reading
Puberty and periods: a guide for parentsPuberty and periods for parents: when changes start, how to talk to your daughter about periods, what's normal in the first years, and when to see a doctor.
Your first period: a kind guide to what to expectYour first period, explained kindly: the signs it's coming, what it looks and feels like, how much you'll bleed, what to use, and when to ask a doctor.Menarche: definition and meaningMenarche is the medical term for a first period. When it usually happens, the signs it's coming, what's normal in the first years, and when to ask a doctor.
First period kit checklist: what to pack for schoolA first period kit checklist for school bags and home: what to pack, which pads to choose, what to say to your child, and small comforts for day one.What are the signs your first period is coming?Signs your first period is coming: breast buds about 2 to 3 years before, then white discharge 6 to 12 months before, plus growth spurts and mood shifts.