HELP, baby chicken won't stop distressed chirping!!!! - Page 2
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I would start by looking at what sort of bedding you have them on? If all they are eating is chick starter then the bedding is the only thing could cause a crop issue. Treatment for sour crop is pretty brutal I would think for a couple week old chick (don't they hold them upside down and massage till they vomit it up?), I would do some more research on signs and treatment in a chick that young first.
In the meantime I would remove the bedding you are using and see if she improves with that gone in case she is just eating wood shavings.
I agree, remove the bedding so they can't eat it. I also wouldn't recommend tipping the chick upside down, ive seen that it can kill the chicken by choking.
What type of feed are you giving her? What type of bedding? Is she pooping at all and what does it look like? You say your possibilities are hunger or temperature. Is she huddling with the other chicks or is she separating herself from the others away from the light. Photos of your brooder set up and you cutie pies would be great.