My son went through a stage where he would stick his hands in his diaper, and even take his own diaper off, especially when it itched or bothered his skin. We ended up getting special pajamas at night that zip in the back and a belt for his pants that we kept pretty tight so he couldn't get his hands in there. I know it wasn't like "teaching" him not to do it, but it did work. In the short-term he couldn't physically do it, and in the long-term he got used to not doing it. He now wears shorts without a belt and doesn't do it anymore!

I have tried a body suit with some success (I got mine off Amazon and it zips up in the back...it looks like a surfing body suit and goes up to size 6T). It prevents my son from eating the fluff and waste, and it even prevented the picking for a while (a couple of months). He had some issue with the zipper and the texture at first, but with some desensitization work, he is fine with wearing it now. He has started opening up the diaper through the clothing now, so it is still messy, but at least the mess is contained and he can't eat the diaper or waste material. It is a constantly evolving issue as he learns the weakness of whatever the newest "fix" is.

You are lucky he is just picking the diaper and not the poop, because that is what happens most of the time with sensory driven children. That being said, you cannot stop it so to speak, so you have to put cloths on that he cannot get into, and try to keep an eye out, and redirect when he is doing it. I agree the pressure will not help, and will make things worse.

This is what makes our kids so different then others, and why parents of regular kids do not understand what we go through. They do not realize we sometimes have to be on gaurd 24 hrs a day, and cannot let up, or bad things can sometimes happen. We cannot leave our kids to play and go read a book or watch TV without checking on them. this is just another example of that.

We werent pressuring him to use the potty, we were trying but gave up. He loves sitting on the potty but would never go. Once I put the training pant he would go. I dont think hes comfortable going out side of his diaper. I told my husband to let him run around naked but hes not comfortable with that. So Logan is back in diapers and we are waiting for the belt to arrive.

Pressuring will only cause him to resist potty training.

Back off and he will decide when he is ready.

Changing his diaper as soon as he goes is the best way to prevent "poop picking".

I would also tell him no if you catch him doing it, and explain that it is yucky, dirty, germy, will make you sick... At the age of 2 kids can usually understand, if you explain something to them.

By the way, many many many toddlers do taste poop. It's gross, but normal.They are curious.

It is up to you to teach him that this is not an acceptable behavior.
I hope this helps! :)