Right now I'm using towels for bedding, as I read that was best to prevent their legs from getting splayed. They are 5 days old now. Can I use wood pellets? When are they old enough that I don't have to worry about their leg growth? I am looking for anything that would make a good cheap alternative to smelly towels! Also, if it's warm outside how old should they be before I let them explore in their pen for a little bit while I'm outside with them?