So my future step son is having a lot of trouble with pooping on the potty. I’m wondering if y’all have any tips for me? The back story is a little long and there’s a some gross details. 

He is 4. He is pee trained completely, just can’t poop on the toilet. When he was 1 he began having bad problems with constipation. He was pretty much always on laxatives. It started to get better around 2 1/2. Then we started potty training. He was pee trained in a few weeks. It has been a year and a half and he still won’t poop on the toilet. He has been holding it in, we know that for a fact, bc he will tell us he doesn’t want to use the toilet, then a week later he will go to grandparents and request a pull up and go.(Yes, he won’t poop for over a week except streaks in his underwear) I had wondered at first if the holding forever was causing permanent damage or something, but the fact that he will go in a pull up makes that not true. He will have streaks in his underwear so we know he needs to go, he will sit on the toilet (doing so right now) and just won’t poop except a little mush in his bum that we have to wipe, and then later on he will end up having a turd stuck in his bum that he pushed out after getting off the toilet. We try to explain that it’s the same as pull up, even easier, to go on the potty. He has a special soft seat and a stool, and we make him sit on the toilet 3 times a day at the same time, and it’s just not happening.

I just don’t know what else to do. He is starting pre-school in the fall and obviously he can’t start if he’s gonna get sent home every day with poop in his underwear, bc I know the teachers aren’t gonna deal with that. And the fact that he is ruining all of his underwear, and pull ups are expensive, he is also a big boy and is almost in the biggest size pull ups, it’s so frustrating for him and us. 

Please only sincere actual advice and tips, I’m at my wits end here with this. Let me know if you need any more details or anything. Thanks everyone.