It appears that the timing of menarche is related to the accumulation of a certain amount of body fat, which is why heavy girls generally menstruate earlier than other girls do.

It appears that the timing of menarche is related to the accumulation of a certain amount of body fat, which is why heavy girls generally menstruate earlier than other girls do.

 
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Studies suggest that genes influence the timing of puberty.

Studies suggest that genes influence the timing of puberty.

 
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Precocious puberty is sexual development before the age of 8.

Precocious puberty is sexual development before the age of 8.

 
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Hormonal increases directly lead to interest in sex.

Hormonal increases directly lead to interest in sex.

 
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