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The average length for a newborn is 19 to 20 inches (in) (48.2 to 50.8 centimeters [cm]) from the top of the head to the heel of the foot, but this can vary. Doctors also consider a range of 18.5 ...
The average age for boys to show the first signs of puberty is 12 years, about 1 year after girls begin puberty. The fastest rate of growth is usually 1 to 2 years after puberty has started.
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