We had the same problem with my son, we tried everything: letting him play with my iphone will on the potty, offering him have a small bag of chips or small bite sized chocolate as a reward, taking him to Target and letting him choose any potty he wanted, but, nothing worked. He refused to go and then became constipated to the point where his pediatrician had to administer a strong enema in her office. After that, we decided to let it go and focus on getting him to pee in the potty. If he had to poop, he could ask for a diaper but then had to put his undies back on when done. I felt like we would never get him to go poop in the potty, then, one day, I found him sitting on the potty and he was pooping! I was sooo excited but realized that he DID NOT want us to make a big deal out of it. When he was done, I let him choose a treat, gave him a high five and then did a little jig when he wasn't looking! So, my (long winded) advice, don't give up! Give him access to the potty and then try not to put too much pressure on him. When he's ready, he will do it!

Same with my son. He has to be ready. We use Miralax everyday to soften the stool. Especially when they are constipated- they associate the act with pain.
The other things that helped- this will sound bizarre, but it worked, and I was sceptical- give him a whistle while sitting on the potty- encourage them to get as loud as possible- it causes them to bear down on the same muscles used for a bowel movement.
My ABA really had me assess what motivates my son- stickers, candy weren't enough of an incentive for him. We had him pick out a dinosaur toy and it stayed in the bathroom across from the toilet so he could see it from the potty. We had one success and he stopped. We bought 5 more toys, lined them up and we were good.
We had to let our son go at his own pace- when we pushed too hard we had self injurious behaviors pop up.

@A MyAutismTeam Member maybe you could just set a timer and ask him to go potty. Like you would at the start of potty training but instead of 30 min make it an hour or 2 hours. Have him try to go and reward him with a simple treat when he does. (mini marshmallows, M&M or what ever small candy he might like) Maybe he just needs a reminder how to check if he has to go. My daughter did this when she was potty training.

As for the main question: I agree with the social story and I know there are some stories out there for potty training explaining BM's cause it's a problem even with NT kids. Good Luck.

Mentioned Users

A MyAutis...

For those of you with younger ones, it is very stressful to try and potty train them, my Floyd was 7 before he was fully potty trained the doctors told me that we would be lucky to have him trained before he was 12 due to communication issues, at the age of 7 about 3 months after his birthday he all of a sudden had his first bowel movement in the toilet, we were so happy, now the only issue we have is the cleaning afterwards, to train him we had to do lots of praises and rewards but it finally worked

@ ShellH your welcome. he will be 13 in April and never has accidents not even at night so look forward to that to, i often think they just need more time to understand and once they pick it up they excel at it