This is the one subject I never understood about myself, until learning about SPD. I have suffered lifelong issues with what I thought was regular constipation - however, it would be as long as 3 weeks before I would actually go. When I finally do get a sensation to go, I don't think it is actually a "normal" sensation. I get what seems to be (sorry.. this is not a nice description and slightly embarrassing) like my rear end is sweating and a slight pressure. That is the only sensation I get alerting me that I have to go.

As for the potty end of things, I just have to remember to go, or at other times it is a sudden urge that can not be ignored or delayed. If I feel it, it is near too late. I also get a type of "stomach ache" that I relate to having to go when i forget too long.

I think that paying attention to the other things going on, like the stomach ache is a way to teach him. If, he has any "tells" that is. I wish you the best.