Can't seem to get my 3 yr old to go poop on the potty. He can pee standing up but I still have to ask him throughout the day and remind him to pee in the potty. Got him some Spiderman undies, he loves Spiderman so I thought he would like them more than a dippy I told him " don't pee on Spiderman, he will be sad" lol. That seemed to somewhat work. Suggestions are welcome.