I have used fleece blankets for birthing but after speaking to some top breeders won`t put it in reg. cages. Seems chins are eating the fleece too, I`m not risking it. Stick with shavings on the floors. If it`s wire bottom cover it with pine, or aspinite, something they can not chew, then add shavings.If the shelves are pine they need nothing.If they are plastic replace, if they are wire replace.