He has been happily using the toilet for several months now with no problems. But this last week he has refused to use it for poos, although he will wee into it no problem. So every evening around dinner time he will start asking me for a nappy - clearly so he can go off and use it instead. I've been saying no - that nappies are for bedtime but he fills it immediately after it goes on. I'm trying to be reassuring and not making a big deal of it but nothing seems to be changing. Any ideas or suggestions on how to deal with this?