Week old pullet was fine this morning ( went to church and lunch approx. 4 hrs) and now she sneeze "chirps" and breathing between labored and gasping with mouth open (no foul odor or anything abnormal looking).. All other chicks appear healthy at this point! about a week ago I suddenly lost 6 chicks from this batch (suddenly and unknown reasons) I just assumed shipping stress and now this happening? I have VetRX and an antibiotic powder that I can make if needed.. any suggestions would be greatly appreciated!