Okay, one of the five (the oldest, the Barred Rock) seems weak. I may be over-reacting, but being new at the chick thing I don't know what to expect. I have observed her eating and drinking, her crop is firm, but not hard... like all the others actually, bigger but she's my biggest chick (135 g while the others are between 101-110 g). Poop looked fine too. But she seems to have very little energy compared with the other four. Case in point: when we pick them up (not often, but 2-3 times per day so they get used to us) most will eventually fly back to their brooder. She just sits, and flaps a little, and when she finally does fly it's with nowhere near the strength of the others. And then she just sits. No wandering or peeping with the other girls. It seems minor, but she is definitely different and lower energy. Could she just be adjusting? She is eating and drinking...