I just recieved some chicks via USPS they were quite late due some circumstances. These RIR chicks came from a breeder, there were some that seemed larger or older than others and they are doing great. A couple of the smaller ones are really struggling, they dont seem to want to eat or drink. They are very listless and lay on their sides when left alone. They are in a nice warm brooder. I have given them water several times with a dropper and they seem to struggle to swallow and sort of gasp after. I have added some yogur to the water to give them a bit of nutrition as well. I am not too sure what I could do in addition to what I am doing now. They seem very weak'