My son has just turned three. He now has some lovely but large toys which are in his bedroom. We're not really up there very often and it seems a shame for him to be stuck downstairs when there are a lot of nice things upstairs. Of course, I would play with him too, but I'm currently trying to encourage him to play alone. There really isn't much for me to do upstairs, so would it be odd for me to leave him up there to play?