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Boys: Genital Changes. The first sign of puberty in boys is subtle -- an increase in testicle size. About a year later, the penis and scrotum start to grow. Physical Changes . Growth Spurts: You may turn around one day and notice that your son is an inch or two taller than the last time you took girls in 7th and 8th grades can often tower over boys their age, the boys can quickly catch up in high school and frequent growth spurts are not uncommon.