Just want to be on the record here in saying that I believe that wire floors for any chickens are cruel and dangerous, but especially for delicate baby chick feet. In other words, if you need for someone to say, no, wire floors are not all right, here I am saying it.
Why? Baby chick feet are so small they could get caught in the mesh, resulting in injuries, not just to their feet, but the legs and tendons should they be walking and abruptly get snagged, halting forward motion.
When I need to put an adult chicken in a wire cage, I lay an old towel down so their toes don't get snagged. And it's just really rough on the foot pads.
Of course, anyone who keeps chickens can do whatever they wish. But if you're a person who needs to hear it from others whether something is good or bad, well, you're hearing it.