OK. It's actually going to be really hot outdoors, 88 to over 100 the next few days. But I will put them out in the shade. Late afternoon when I get home from work. I'm not sure why the one is so much younger than the others when they all came into the store on the same day. Oh well. They all get along fine.If temps are over 75* at night, then most 3 week olds will be fine. The two week old birds still need extra warmth at night. Start getting them outside during the day to help them adjust.