One of my four day old chicks is sneezing. I haven't figured out which one it is yet but I can hear it every now and then. Is this anything to worry about? I did find one of the 15 laying on the ground dead this morning. They were delivered through the mail on Tue. No indication of what she might have died from. It was a buff polish chick. I figured it might have been stress. When I went to bed last night they all looked fine.