For babies, use paper towels. They are easy to change and do the job. Once mine got bigger, I looked at ceramic and slate but found something I like better - outdoor carpet. I bought enough of it to cover the bottom of her enclosure several times over. I cut it to fit, then used a lighter to melt the edges and get rid of the loose threads. For spot cleaning, I use a paper towel to pick up any mess. It looks really good and once it gets dirty, I swap it out with a clean one. The dirty one is thrown on the deck and hosed down for cleaning.