Maybe everyone else knows this already, but since I had so many broody hens hatch chicks this spring, I got to see a fair number of chicks very early on, and I noticed that right after they hatch and even after they're dried, they sometimes can't really walk, or they kind of creep along without actually standing up. At first I thought mine were having leg problems, but I think they were just extremely young, because after a day or so, they could walk perfectly well. So I think it just takes them a day or two to get their "sea legs" if you know what I mean.