I have 1.5 week old chicks. This morning when I came out to check on them, I noticed 1 of my barred girls opening her beak and closing it, like she was trying to breath. She did it a couple times. I went inside to get my phone, so I could try to video it. By the time I got back out, she wasn't doing it anymore. I still separated my 3 barred girls. I've been now sitting with them for an hour and none of them have done it again. What's the chance it's not a respiratory issue and she was just too hot?