Children reach puberty at very different ages, which is why often there is a big size difference between friends who are the same age.
For Girls …
In girls, the first sign of puberty is usually the appearance of breast buds, which can happen any time between age 8 and 13.
For Boys …
For boys the first sign of puberty is usually the testicles getting bigger, followed by the appearance of pubic hair. This happens between the age of 9 and 14 for most boys.
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