My 3 and half year old will still not poo on potty. I have tried bribing with toys, telling him how clever he would be, reward chart, special pants - you name it I have tried it. He struggles a bit with his poos anyway - well he always stands up and has to be in a room on his own to do it. Wanted to give it a bash in Easter hols - but think it will be a no go - insists he needs a nappy on to poo. Even tried laying nappy in potty! Any advice would be appreciated, please.