When my child was four, I was told she was to young to have ADHD
Before the age of seven, some children out grow this and does not have ADHD
My child is a high functioning Autism
Autism, can look like ADHS
I would go to his doctor and ask if he should be tested
Also look into a birth to three type in your state
Your child is way to young for Adhd
At two, try to get him in to something like Karate
That helps some children with control