I have been considering an evaluation for DS2, so I was reading up on SPD and came across this. I also read your comments on the potty training thread but thought I'd post the link here.

The Poop on Interoception

Can your son tell he has to go? My son doesn't seem to be able to recognize the feeling that he needs to go, but he'll pee if I take him to the bathroom at appropriate intervals. Poo is a whole other story... but I'm hoping that it's early yet.