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If you find an improvement in this one bird, then it's likely that your entire flock might have a slight vitamin deficiency with only this one bird presenting symptoms. Alternately maybe this baby didn't absorb as well.
Can you tell us what type of feed you're feeding at the moment? Also make sure that it's fresh, fresh enough to where when you smell it you smell good fresh ingredients. It shouldn't be overly powdery and shouldn't smell of cardboard. Also it's best to use feed within 2 weeks, but at least within the month.
It wouldn't hurt to put all the babies on a vitamin/mineral supplement for poultry for four to five days and then taper off.
Additionally, I would give all the babies a dose of yogurt daily for a week and then taper off. The milk product is a source of riboflavin, and the living bacteria within the yogurt help to colonize the gut with more of the same bacteria they already have in there (lactobacilli). The beneficial bacteria will help keep your birds more resistant to digestive issues as well as helping them more efficiently use the nutrients in their feeds.