Wire floor isn't good for chicks' feet. I cover the shavings with paper towels for the first few days, because they eat a lot of it. They won't die, but. They need to be eating food and not shavings.
I happen to have a bunch of doggie pee pads I no longer have a dog for, so I thought I'd try them out in the brooder. We're only a few hours in, but so far so good.