So I think one of my 6 weekish old chicks may have a cold/sinus or respiratory infection. its a little silkie who has been being bullied by the other chicks they have pulled most of his feathers out except tail, head, wings, and a few other random spots back belly and breast are all skin but no sores or wounds. Well I brought him inside today because he was freezing its really cold here and hes practically featherless and is not allowed under the heat lamp by the others. Anyway I noticed he has crusty boogers on his nostrils his breathing is a little bubbly sounding at times and hes stretching his neck and yawning a lot, he also is snapping his beak shut and making a clicking sound when he does it. My thought is he got chilled because he has no feathers and then caught cold/got sick, what can I give him and how much.