Well, my ds has been using a toilet for pee since 2 1/2 but still uses a diaper for poop. He just tells me when he wants a diaper and I put one on. About a year ago (just over 3.5), he really needed to go and I was in the middle of something and put him off saying "in a couple of minutes". I would have dropped what I was doing if he seemed distressed, but he just seemed to think that I had a legitimate excuse and he ran over to the bathroom and used the toilet. So I know he could and would use one if he had to, but I think our relationship is more important than making him use a toilet. My ds can hold pee for 24 hours. Drives me nuts if he doesn't want to use the toilet before bed and I'm sure he hasn't gone since morning. But I try not to let it show. He never has accidents but he gets so squirmy and cranky when he is holding it.
Do you think your ds would ask for a diaper if he wasn't wearing one but knew you would put one on him as soon as he asked? It seems to me that SID would eventually work in your favor since he doesn't like that messy feeling when he uses a diaper. I wonder how it would work to use progressively bigger diapers so the poop had a place to drop and maybe would feel closer to being bare bottomed? I don't know how you would find big enough diapers. Maybe adult xxsmall depends. Something must exist for big kids, though.
Do you think your ds would ask for a diaper if he wasn't wearing one but knew you would put one on him as soon as he asked? It seems to me that SID would eventually work in your favor since he doesn't like that messy feeling when he uses a diaper. I wonder how it would work to use progressively bigger diapers so the poop had a place to drop and maybe would feel closer to being bare bottomed? I don't know how you would find big enough diapers. Maybe adult xxsmall depends. Something must exist for big kids, though.