My chicks are about 6 weeks old now. I've been taking them out to let them "play" in their run during the day, when it's warmer, but bringing them in during the cooler nights. Morning before last, my 2 Buff Orpington pullets were sitting all puffed up and almost unresponsive. One was wheezing. We got hit with a cold front coming thru the day before and they had gotten a bit chilled before I got out there and brought them in. I was so scared that morning! I got a little water in the 2 pullets - dripping it off my finger and into their mouths. Then I put a heating pad under their brooder bin. After about an hour, they seemed much perkier and they seem fine, now. Was it just that they got chilled or is there more I should be concerned about?