This week we bought a buff orphington and an austrolope. (We are first timers and planned to get three chicks). We've had these two for 4 days and just added a final Barred rock chick to the mix. I had researched and asked the store, and it seemed that it would be fine to add the chick at this point. They are all nearly the same age or just a few days apart and getting along well. However, the new chick is constantly chirping and seems to be looking for his old friends from the feed store. My other two didn't react like this when I brought them home. My little newbie Barred Rock seems really stressed. She rarely stops chirping loudly and looking around the brooder. Any thoughts or suggestions?