Hi clare40
Ok step one ..... take a deep breath. This is a long and complicated process to assess for ADHD.
Firstly it is very hard to diagnose ADHD in under 6 years olds for the simple reason that a lot of the most common and obvious symptoms are common in probably 95% of young, fit children.
The three symptoms are impulsivity, hyperactivity and inattention (dont be mislead by the last one and do some research on the internet to fully understand what they all really mean - no disrespect intended but sometimes it is not obvious by the single word title).
So basically you are trying to compare your child against a "normal" child of a similar age. Of course what, you ask, is "normal"?
Children develop at a great rate upto the age of starting school.
Once they are in school you are more able to compare them with their class mates (or at least their teacher is !!!)
Do some research on the web and listen to your gut feeling - you are the expert where your child is concerned. If you still have concerns speak to the class teacher when your child starts school and ask them to keep you updated with their opinions / feedback. The older the child is, the more obvious the differences are between a non ADHD child and one with the condition.
Many of the symptoms of ADHD are also similar to symptoms for other conditions such as Dyspraxia and Autism. The symptoms have to be obvious in more than one setting such as at home and at school and at friends/families homes. If they are only apparent in one setting it is unlikely to be ADHD.
Treatment for ADHD is largely behaviour management - many of the techniques work well for all children (not just ADHDers) so it is worth starting on them now to help your child even if he is just a bit over excitable rather than ADHD - Medication is really a last resort for officially diagnosed children. It is a very powerful drug and will not work for children without ADHD.
A diagnosis can only be made by an experienced child psychiatrist and not at GP but your GP would be the person to see first to get the referal to see a child Psych.
My advise to you would be to start on behaviour techniques now, do a bit of research on the internet, keep an open dialog with school and if by the age of 6 to 7 your child is still displaying all of the characteristics ask your GP for a referal.
Good luck to you and your family x x x