I would STRONGLY suggest a sensory assessment by an Occupational Therapist who specializes in sensory integration. My son was so out of control movement wise from the time he was born (rolling over at 2 days, crawling at 4 months, walking across the room at 8months, etc.). He had very little reaction to pain, or over reaction to pain, and was always in constant motion. I took him to our pediatrician because it was obvious something was up at 2. My oldest was having an assessment at the Occupational Therapist, and during the assessment my youngest was out of control movement wise. Could not sit down, could not stop moving, etc. The OT strongly encouraged me to have my youngest assessed, and we were floored with his results. He had major Sensory Integration issues, and was immediately started in OT twice weekly. Sensory issues in young kids, especially boys looks a LOT like ADHD. Both of my kids have differing sensory issues, and the two pediatric neurologists were so quick to want to drug them. We refused, and instead kept on our path with OT and we now have two kids who can function. We have a variety of other therapies as well, because my youngest was eventually diagnosed with high functioning autism, and my oldest was diagnosed with Asperbergers (ADHD is thought to share a spot on the spectrum). I honestly wish we had our sensory assessment done much younger than it actually was, because once kids hit a certain age the neuropathways are less pliable. The therapies still work, but are much more effective in younger children. My youngest loves his OT time, it's like playing in a huge gym for 2 hours a week. Kids don't develop ADHD as they age, just as they don't develop autism as they age. If your child has it, he has it now. I would recommend finding an amazing ADHD assessment at a local children's hospital, and make sure they do an impulsivity screening. Our initial diagnosis was ADHD and once we brought him in to the autism clinic, the first thing they did was disprove ADHD through an impulsivity assessment. That assessment showed he was nowhere near ADHD, and sat and attended for the entire assessment. Once they pulled out the autism assessments...it was on like Donkey Kong and it was so obvious we were dealing with something way different than ADHD. It also helped that we went in with language (expressive, receptive, pragmatic) assessments, OT assessments, and a behavioral explosion.