I'm trying to potty rain an almost 3 year old. He is no longer afraid of the potty and I'm not sure if he realizes that he is suppose to pee in the potty. Today after sitting on the potty for five  min he starte to pee as soon I pulled up his underpants so I sat him on the potty still in his underpants. He finished going in the potty and got excited when he heard himself.  He won't go in the potty if he doesn't have big boy pants on. Should I not have done that the first time. Before he would pee in his underpants and keep playing when he goes. Now he stops and looks at me like "oh no I'm wet" but he won't go into the bathroom when he starts to go.