Ummmm, the teachers say he is very smart - and he barely makes it to second grade? They have noticed he gets distracted. Kind of common for 6 and 7 year old boys, but it sounds like they notice it more with him then the other kids? Something is not quite right. Beginning to think it might be his doctors.
How did they reach their decision? They should have had both the home and school fill out surveys about him. If all they did was to observe him in their office - that is not the accepted practice. And, if the surveys were done (?), the time of year is important as that relates to how well the teacher knows the child. And, its always possible that the doctors are looking for the classic hyperactive child and not one who has ADD or ""Predominantly Inattentive Type". A good link on the differences is here -
I certainly would consider another medical opinion, but unless you can find a pediatrician who specializes in ADHD, I would like for a child psychologist or psychiatrist who specializes in ADHD. And, if he does have ADHD - these doctors will be a much better resource to work with you and him in dealing with this. I hope this helps if you have any more questions please post here or here where I also am the CL http://www.medhelp.org/forums/ADD---ADHD/show/175