I just got home from work and found one of my 3 day old chicks breathing heavy. It was a lot cooler in the brooder then I wanted it to be, but I ended up working an extra shift and didn't get to adjust the height of the light for night temperatures, they were all huddled up near it, so I know it had gotten too cold. They all seem lively, running around drinking and eating after I lowered the light. The one that is breathing odd moves it's whole body into the breath, I guess the only thing I can compare it to would be a bee in the fall when it had gotten too cold and makes a similar pulsing move. Another one of the chicks is doing it too, but not as bad. The odd breathing one is running around picking at it's siblings, he was drinking and eating with the others, none act sick or uncomfortable. I just want to know is that normal or should I be worried?