The first thing you need to know is that puberty -- that time when girls and boys develop secondary sex characteristics and fertility and start becoming young women and men -- arrives on a different schedule for every child. At the same time, puberty is occurring earlier in general, so don’t be alarmed if you notice changes at a younger age than you experienced. Typically, puberty starts in boys between ten and sixteen. Yes, girls start earlier, which is why they’re often uncomfortably taller than boys in junior high. Puberty can last a few years or several, so don’t expect this ride to be short.
From The Smart Parent's Guide: Getting Your Kids Through Checkups, Illnesses, and Accidents by Jennifer Trachtenberg.
Find out more about this book:The Smart Parent's Guide: Getting Your Kids Through Checkups, Illnesses, and Accidents