Define premature or precocious
Puberty before 8 yr old in girl and 9 in boys.
Define delayed puberty
Onset after 14 yr in boys and girls
Define Thelarche
Breast development
Define pubarche
Pubic hair development
Define menarche
First menstrual period
First signs of puberty
Girls is breast buds
Boys is testicular enlargement
What factors influence age of menarche
Body fatness
Ethnicity