It is always your prerogative to get a second or third opinion. Having had tendencies in grade 1 it may well be ADD as one does not outgrow these behaviours.
There is so much information out there on Ritalin and most of it is very daunting. On this site alone some people have found Ritalin to be unhelpful, while others have found it to be THE answer. Time will only tell how your son will react to it.
Please keep in mind there are other options to Ritalin such as Concerta which has a milder rise and fall of effect and Strattera which is a non stimulant and takes longer to build up in the system and be effective.
If you are starting medication, I encourage parents not to tell the teachers and ask casually after a week or two how your child is doing in class, and keep a journal of his behaviour at home.
If the teacher doesn't mention any changes, either she is not very observant or the medication is not as effective as it should be. That is the reason for keeping a journal at home, particularly on the weekends when you can see the full effects.
Best of luck,
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