Puberty is the process by which a child’s body begins to change into an adult’s body. It is a natural, normal and healthy process. Some of the changes that happen during puberty make it possible for you to become a mother or father someday.
Everyone develops at their own pace. There is no set age when puberty starts. For girls, puberty usually starts between ages 8 to 13. For boys, it usually starts between ages 9 and 15.
During puberty substances called hormones cause changes in the body. Some of these changes are:

Hair growing in areas like the armpits and pubic area is normal during and after puberty.

It is important to keep your body clean to reduce body odor.

Getting pimples in a normal part of puberty.
Note: Not all the changes during puberty are physical. During puberty children may feel confused. They may feel very strong emotions that they never had before. Also, they may get upset very easily. Learning to manage your emotions is an important part of growing up.