Gape worm or respiratory problems? *update* AND impacted crop?
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Can you post photos of your brooder setup and the chicks?
Any signs of watery eyes, nasal discharge, coughing, rales, etc.?
What type of bedding are you using?
Sneezing can be caused by many things - from environment (bedding, dusty feed, etc), not enough ventilation to respiratory illness.
]+to much lol. It is kind of chilly in there so i closed the ac vent. I believe it is pine shavings in their brooder. It's what I use in my other coops.