Thelarche is the onset of secondary breast development, which often represents the beginning of pubertal development. The initial growth of breasts occurs during fetal development in both males and females. Thelarche is the stage at which male and female breasts become distinct due to variance in hormone levels; however, some males have a condition in which they develop breasts, a term called gynecomastia. Thelarche, also known as breast budding, typically occurs between the ages of 8 and 13 years with significant variation between individuals. The cause of this variation is a question central to countless research projects, yet it is generally accepted that race, genetics, exercise, and body mass each influence the age of thelarche. Puberty is considered delayed if breast development does not start before age 13 or if a female has not had her first period (menarche) within 3 years of thelarche.
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