Early or precocious puberty is when a child reaches a physical or hormonal milestone -- breast, testes, or pubic hair growth -- before age 6 to 8 in girls or 9 in boys. Early puberty is linked with obesity in girls. 

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Puberty stage is where a specific person reaches the process of adolescence wherein a lot of changes in a person, physically and mentally, occurs. 
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puberty stage is the period during which adolescents reach sexual maturity and become capable of reproduction