when is the best time to use diaper rash cream on your new born?

Witness
Any one knows when is the best time to start using diaper rash cream on a new born? My husband and I are arguing a lot, he thinks it's a waste of money to have it and I think it's worth having it and do not use it if it won't  be necessary. He thinks baby won't need anything artificial on her skin for the first few weeks. 🤷🏽‍♀️