Puberty in boys and girls
The physical changes that occur during puberty are usually marked by distinct stages of development.
The stages are known as Tanner stages, named after Professor James Tanner, the child development expert who first identified them.
The Tanner stages give average ages of development, although there can be significant variation among children and teenagers. You therefore shouldn’t worry if you reach a stage of puberty before or after your friends do.
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Originally posted from tinystep blog