My 25 CX are 12 days old. I have them in a 4x6 brooder on pine shavings. I noticed a couple of days ago they seem to sneeze a lot. They seem to be in good health? They eat, sleep, and poo like meaties, but they also run around the brooder and flap their wings apparently having a good time. Should I be concerned about the sneezing or is it just because they are so dusty? The shavings I have them on are pine shavings, about 4-5 inches deep. I stir it daily and top dress as needed to keep the smell down. Any thoughts?