Our ds was, and still is like this. We have tried giving him toys as well. Sometimes it's a book, a remote control or the TV, even the car keys a couple of times lol.. Lately we have been giving him some bum wipes and he wipes the wall down while we change him. Sometimes a bottle with a drink would work too. Nappies maybe? The last few weeks (and I realise my little man is a bit older in age) we have been showing him the shirt he will wear for the day, and he cuddles it while we change him out of his wet nappy.