One of my chicks has been 'bathing' in anything soft, such as blankets. It's the kind of behaviour seen when chicks are in dust baths. I read somewhere that they can have dust baths from an early age but I'm unsure of what age is usual & what sort of sand to use. They're four & a half weeks old & only one chick has been doing it. Shall I introduce a dust bath soon? Thanks for any advice that you can offer.