What is puberty?
Puberty is the time in life when a young person starts to become sexually mature.
In girls, puberty usually starts around 11 years of age, but it may start as early as 6 or 7 years of age. In boys, puberty begins around 12 years as age, but may start as early as 9 years of age. Puberty is a process that goes on for several years. Most girls are physically mature by about 14 years of age. Boys mature at about 15 or 16.
What are the first signs of puberty in boys and girls?
The first sign of puberty in most girls is breast development. The first sign of puberty in most boys is an increase in the size of the testicles.
Does sexual development have a typical pattern?
Yes. In girls, breasts develop first. Then, hair starts growing in the pubic area. Next, hair starts growing in the armpits. In girls, acne usually starts around 13 years of age. Menstruation (the period) usually happens last.
In boys, the testicles and the penis get bigger first. Then hair grows in the pubic area and the armpits. A small amount of breast tissue might develop at this time. The voice becomes deeper. Muscles grow. Last, acne and facial hair show up.
Does sexual development always follow the same pattern?
No. Some children can have different patterns. Some girls develop breasts at a very young age but have no other signs of sexual development. A few children have pubic and armpit hair long before they show other signs of sexual growth. These changes in pattern usually don’t mean the child has a problem, but it’s a good idea to visit your doctor to find out for sure.
What is early puberty? What causes it?
Early puberty is sometimes called precocious or premature puberty. In most cases, early puberty is just a variation of normal puberty. In a few cases, there may be a medical reason for early puberty.
You may want to visit your doctor if a young girl develops breasts and pubic hair before 7 or 8 years of age.
You may want to visit your doctor if a young boy has an increase in testicle or penis size before 9 years of age.
What is delayed puberty? What causes it?
Sometimes (but not always) a medical reason causes delayed puberty. For example, malnutrition (not eating enough of the right kinds of food) can cause delayed puberty.
Puberty may be late in girls who have the following signs:
- No development of breast tissue by age 14
- No periods for 5 years or more after the first appearance of breast tissue.
Puberty may be late in boys who have the following signs:
- No testicle development by age 14
- Development of the male organs isn’t complete by 5 years after they first start to develop.
Do early and late puberty run in families?
Both early and late puberty can run in families. There can be other causes, too.
How will my doctor know what is causing the change in puberty pattern?
Your doctor will talk to you and your child. Then your child will have a physical exam. The doctor might suspect a cause for the puberty variation and order some tests. Sometimes the cause can’t be found even after several tests.
These are some tests your doctor might order for your child:
- Blood tests to check hormone levels
- An X-ray of the wrist to see if bone growth is normal
- A CT or MRI scan (special pictures) of the head to look for a tumor or brain injury
- Chromosome (gene) studies
Are early and late puberty treated?
In most children, no cause is found. It’s just a variation of normal puberty. No treatment is needed. In some children, a medical cause is found and treated. For example, if the reason for late puberty is lack of hormones, hormone medication can help.
What can I do to help my child?
The way children see their own body has a lot to do with their self-esteem. It’s important to let children know they’re OK the way they are and that you love them that way. You can let your child know that he or she is normal (when the tests are normal). You can tell your child that you’ll help him or her with any problems (if the tests show a problem). If you need help or if you think your child may need counseling, talk to your family doctor.
- Disorders of Puberty by RD Blondell, M.D., MB Foster, M.D., and KC Dave, M.B.B.S. (07/01/99)
Copyright © American Academy of Family Physicians
This information provides a general overview and may not apply to everyone. Talk to your family doctor to find out if this information applies to you and to get more information on this subject.