D.W.
I do not like pull ups because I feel children confuse them for diapers. Tell him there are no more pull ups and he needs to poop on his potty. If he is afraid of the big potty buy him a little one. They sell all kinds at walmart. My son is three next month. We started back in April. One day back in May
( about a month ago or so) he told me he had to poop and he wanted a diaper. I told him no he needed to go on the potty.I told him I would buy him a pillow pet if he pooped on he elmo potty and he did. We bought a pillow pet and I think since then I have changed 1 poopy diaper. Get rid of the pull ups and buy him some big boy underware and a training potty. If you find something that he likes then he will go poop.. bribery works for potty training.