When your son is a toddler, it's hard to imagine that one day the chubby little boy who climbs up onto your lap for a snuggle will grow into a man. As puberty begins, limbs stretch, muscles thicken, the voice deepens, and new hair appears. Less apparent are the internal changes. Young men begin to experience all the pressures, desires, and anxieties that grown men feel. Girls are no longer playmates but potential sexual partners. You and your son may feel overwhelmed by this transformation.