I have my 6 week old chicks (4 cochin mixes) in a 2 foot x 4 foot cage with a roost. I keep them in there all day, except for about 30 minutes when the other chickens are still in their coop/run. I worry that the babies don't have enough room in that small area. Are they ok in there until they get to 10 - 12 weeks old or do they need a bigger area? Thanks.