I had 3, what I thought were 2 or 3 days old, which were probably more like 10 days old that I tried to put under my broody who had 3 days olds under her. She just wouldn't take these 3, not mean, but wouldn't let them eat,so I had to remove them. In the other side of the coop, I had 3 two month old banties. I put the 3 babies in that coop, in a blue tote, but then the weather got to hot for them to be in the tote. I left the tote in he coop, in a corner, where there was just enough space for the babies to get behind it. I put a dish of food and water in that little space. Within 2 days, those banties were mothering the 3 babies. There was occassional pecking, but the babies would escape around the tote. I kept the tote in there for about 3 weeks, I would just move it out slightly every few days to accomodate the babies as they grew.