Puberty is the stage in a human's individual development where the person achieves sexual maturity. In puberty, the child's body becomes the body of an adult. 

Puberty usually begins between the ages of 9 and 14. It is caused by changes in the hormone secretion of the young person. 

The pubescent person grows quickly. Girls usually begin growing earlier than boys. 

During puberty, the person's body will also begin to produce more sweat, and the formation of pimples on the skin becomes more common. 

At the same time as the person's body changes, their mental qualities also change. 

During puberty, it is common that the person experiences rapid mood swings. 

The beginning of puberty happens at different ages, depending on the person. Likewise, the ways in which puberty can be seen by others varies greatly depending on the person.