Three days ago chick started with labored breathing. Acting normal, eyes bright and clear, no mucous discharge from nostrils or eyes but a slight sniffling was noted, color seems good. She is currently on medicated chick starter with access to water. Haven't seen her eat, noticed her pecking. She was in with 39 other chicks and no other chick is displaying these symptoms. She seems to act normal otherwise, before being isolated she was chasing and being mean to other chicks. Today her breathing has a tiny raspy noise. I've seen her adjust her crop last night as well. She is/has been bedded in small pine shavings. So, now I'm wondering, is this an upper respiratory infection or some sort of congenital defect now showing up as she's growing or did she eat a piece of shavings? My real question is what type of medication should I give her if we do have an URI? Thank you for any help!