I know two of my children, one with autism and one with autistic tendencies, both had delayed potty training, but they were both trained by 5. My Aspie, on the other hand, was trained at the normal time. But the one thing I've learned in dealing with them all is that they often don't do thinks expected of other children. So I'd guess it could be normal. I also know a number of autistic kids who have gastrointestinal issues that might complicate bathroom training. As he goes through the school years, though, he will have inevitable social issues if that doesn't get under control, so he may come to want to be trained soon.
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