I just bought four baby chickens, I'm guessing no more than a week old. Right now I have them in a fairly large plastic tub with a heat lamp pointed in one corner. I'm concerned that the light makes it hard for them to sleep, but I also don't want them to get to cold. We keep the house around 75 right now, so not sure. They don't sleep right underneath the light, but not all the way at the other side of the tub either.