This is from the e-book on caring for your chicks on mypetchicken.com
Absorbent bedding
Baby chicks are big poopers, so make sure to line the floor of their housing unit with an absorbent material. The best, we think, is to spread pine shavings about 1" thick. Resist the urge to use newspaper! It's not nearly as absorbent and the slippery surface can lead to a permanent deformity called "splayed leg" which can ultimate result in the other chickens picking on the affected bird to death. Many people also swear by paper towels, changed often. (DON'T use cedar shavings, no matter what friends or your local feed store tell you: the aromatic oils will irritate your chicks' lungs, and make them more susceptible to respiratory problems later in life.)