Does your child have adhd even if he can sit still and pay attention if he is doing something he likes?

Yes! I have ADHD, so I know first-hand. I love to read, and when I do I can sit still for hours on end if it's a good book. In fact, that's what I do during car trips and plane rides. If your child has ADHD and your going on a trip, have them bring something they like (DS, book, puzzles) and you may be surprised how still they can be.