Cold or Coryza?
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I'm wondering if the bedding is too aromatic for them. Chicks (chickens) can be sensitive to smells which will make them sneeze. For example Cedar is way too aromatic and can cause problems.
You may want to try changing out to plain pine shavings and see if there is any improvement. Sometimes its a process of elimination.
Since they are quite young I would look at environment causes (odors, dust, etc.) instead of respiratory illness at this time. But if making a change still does not help, then reassessment of symptoms may be in order.
Edited by Eggcessive - 4/7/16 at 7:03am
I have 3 more chicks coming Tuesday and have set up a separate brooder in case this turns out to be something contagious. Thanks for checking in!
I would keep an eye on them. If you see any discharge from the nostrils or eyes then it may be a respiratory illness. Chicks are constantly digging through bedding, their food (crumbles) is dusty, the chicks themselves are dusty (shedding keratin to grow feathers), they will sneeze occasionally. If they are active and growing at the same rate as the others, seem to be happy/healthy otherwise then hopefully they are just a little more sensitive to dust/dander in the environment.