I am at a loss. My 9 week old mix breed is lethargic and seems to have stopped gaining weight. She/he is tiny compared to the others! She had an impacted crop 4 days ago but that has cleared and seems to be moving well since it is empty every morning. I thought it may be sour because after the impaction cleared, it was really squishy but then that cleared too. Come to think of it, it is quite a bit bigger compared to the other bird's. Her crop feels stretched out all down the front of her but it does not hang off of her or seem pendulous. Her poop looks normal, she eats and drinks and no mites. I don't think she's loosing weight but will start weighing her today. She was getting trampled around the feeder because she falls asleep and is not as forceful as the others where she once was. So I put her in a sick bay on the floor of the coop. The others nap beside her and when I let her out for a half hour of playtime with her mates, they leave don't bully him/her. She/he seems to fold right back in then starts to fade again (eyes really heavy, puffs up and stands still) so I pop her back in the cage out of fear of getting trampled. I have ACV in her waterer, fed her boiled eggs and yogurt, today I gave her some crumble softened with a bit of water. Again, she's eating & drinking really well. Any ideas if I should try something else? I'd really like to see her perk up and hold her own.