We have 3 about 11 wks old and decided to get bigger ones to put out in the coop/run area..... We are using the smaller original ones in the dog crate with the 2 younger chicks that are about 6 wks old..... you know how that chicken math works!!!! The bigger feeder is working out really great for us as we live in a very hot state without lots of rain so we don't have to refill the feeder every day like before..... and we don't have to worry about the water getting low during our really hot days here in Arizona.
Hope that helps!