Attention-deficit hyperactivity disorder, or ADHD, is a condition that makes it unusually difficult for children to concentrate, to pay attention, to sit still, to follow directions, and to control impulsive behavior. While all young children are at times distractible, restless, and oblivious to parents’ and teachers’ instructions, kids with ADHD behave this way much more often than other children their age. And their inability to settle down, focus, and follow through on tasks in age-appropriat