The back story is we started out with threek chicks, about 6 weeks old when we got them. One RIR, a barred rock and a buff orpington. The buff orpington didn't make it. So we got 6 more chicks, a few days old from the local feed store. Two of each of the same breeds. Now at about 2 1/2 weeks old, the RIR are the largest... I know chicks are going to grow at different rates, but the runty one of the bunch is a buff orpington. She is half the size of the RIRs. She seems to be feathering out at the same rate as the two barred rocks and other buff. She seems to eat and drink okay, but seems to sleep more then the others. I guess this worries me becasue that seemed to be the only symptom of the first buff we had... she slept a lot more then the others and just didn't grow at the same rate. I am hopeful she will make it and is just small, but in the back of my mind I can't help comparing her to the one we lost.