For parents and caregivers
Puberty and the body
Children develop at different rates.
Children of the same age can develop very differently. Some start early, others later, and the changes happen gradually.
Understanding the situation
Breast development is usually the first clear sign of puberty in girls. In boys, it is an increase in testicular size. Body hair alone tells us less about how far puberty has progressed.
Breasts may develop at different rates and feel tender as they grow. The first period usually starts after breast development has been underway for some time. It is more useful to follow your child's development over time than to compare it with their friends.
There is a difference between developing earlier than friends and entering puberty unusually early. Notice which changes have occurred, when they began and how they progress. This provides a better basis for medical assessment than the age of the first period alone.
Turning knowledge into action
What you can do
- Reassure your child that differences between friends can be part of ordinary development.
- Ask how your child experiences the changes and comments from other people.
- Discuss concerns about unusually early or late development with your GP.
Find a way to start
One way to begin
“It can be difficult when your body develops earlier or later than your friends' bodies. How does that feel for you?”
Use your own words and give your child time to respond. A short conversation can be a good beginning.
More help with the conversationFurther support
When should you seek help?
Breast development before age eight in girls or puberty with increased testicular size before age nine in boys should be assessed by a doctor. Early body hair or changes in sweat odour may have other explanations and should be assessed in the context of overall development. Contact your GP if development seems late, unusually rapid or has stopped. If a first period has not occurred by age 15, this should also be investigated.
See who you can contactContinue learning
Other useful topics
Sources and further reading
Sources were checked on 13. October 2026. The conversation examples are suggestions from Tidlignok.
This content provides general information. Healthcare professionals can assess your child's symptoms, circumstances and treatment needs.