I mostly don't use anything. If her bottom does start looking a bit red or nappy rash-like then I might put on a little bit of Curash, but I do use liners and terry flats not MCN's.
when she was a newborn I used a bit of cornflour. I don't think baby powder is recommended, particularly for girls as I think it can contribute to cancer in the reproductive system? I'm sure I've read that somewhere...