As transitioning into early adulthood begins, children go through the physical changes of the sexual maturing process- puberty. The stages of puberty are known as the Tanner stages and were created by professor Dr. James M. Tanner, a British pediatrician. Not everyone experiences the changes of puberty the same. The way one grows and develops can be completely different from the way their peers develop. The Tanner stages outline a general guide on the development of secondary sex characteristics.