What Are the 4 Stages of Puberty?
Puberty is a sequential series of physical changes that lead to sexual maturity. These changes are described by Tanner stages, named after British pediatrician Dr. James Tanner. The stages are based on the development of secondary sex characteristics. Tanner stage 1 is the prepubescent stage with no observable sexual development; stages 2 through 5 are the four stages of puberty.