I always encourage sports for children with ADHD, but T-ball is not one of them. It’s just way too slow and boring for anyone with the least difficulty in maintaining focus.
If you watch a t-ball game the vast majority of the time is spent doing almost nothing. My own son does not have ADHD and it was the only sport he absolutely refused to play. I was pretty relieved because I was so bored trying to watch it, and I love baseball.
I would much see rather kids this young playing catch or stickball or any other baseball variation in small groups. Not only is it more involving, but they develop their skills a lot more quickly.
This brings me to a larger issue; I really worry about young kids spending so much of their time in organized and supervised activities. When I was a kid we played ball and other games with two, three or four kids or whatever without any adults to bother us. I think this developed creativity and social skills in a way that will never happen in these highly organized activities.
Let’s just let kids play and be kids and get the adults out of there!