DS will be 2 next month. I purchased a seat that goes on the toilet. I have sat him on it a few times in the last month or 2 but he has never gone while on it. He says pee pee after he goes. However he calls everything in his diaper pee pee even poop. Yesterday he somehow undid his diper underneath his 1 piece pj's and got poop everywhere. Today he removed his 1 pc pj's and his diaper. I am assuming this means he is ready to try potty training. Need some advice.