"Pushing, pulling and carrying heavy things are often recommended as part of a daily "sensory diet". I have more to say about this topic if you consider going down this road "

hehehe, one more benefit to feeding and cleaning up after his calves!

I don't want to be looking for something that's not there. And because he is doing so well in school, maybe everything has just been normal development, just a bit slower for him. Or maybe what we've been doing with swimming lessons, piano lessons, physical activity on the farm, etc., has been the therapy he's needed to progress? I was thinking about getting him a jump rope, after all, boxers use jumping rope as a training tool for improving their footwork and coordination.