Hi M., I just had to respond to this. My son is will be 5 in October and did not start pooping on the potty until 1 month before he turned 4. He sounds just like your son. He would want a pull-up, and if all the pull-ups were "gone" he would hold it for days. My pediatrician said to just give him a pull up and be thankful he at least asked for one of those because lots of kids just poop in their undies at that age. I also had so many parents tell me that he will do it when he is ready. I was sure my son would be 12 years old and still asking for a pull-up for poops, but that was not the case. We had just moved here to Florida and, for the first time, had a pool in our backyard. My son asked if we could swim and I said, that we could swim later after I unpacked some stuff, or "if you poop in that potty, I'll take you swimming anytime you want this week". I was very casual about it because I was sure it wouldn't work. And do you know what, that boy went and pooped in the potty. He had done it before with us forcing him, etc., but this was the first time he just walked in and did it. And, somehow he got it from that point on. It had also been about 3 weeks of us not applying any pressure or hiding the pull-ups, so it didn't seem like such a big deal. I wish I had just relaxed a lot more about all of that. I do believe that these kids will not respond well to pressure in this area. So, my advice to you is to just keep giving him the pull-ups. Let him know that you'd like for him to poop on the potty when HE is ready and just take a step back from it all. Look at the brightside...at least he goes in a pull-up and not in his underwear! Hang in there!