Sounds like your baby might have another issue? Niacin is always a good start and a good bet. Like someone else said should recover in 2-3 days if that’s the issue. I had a pekin duckling who needed niacin more than the others, I supplied him with brewers yeast on feed. However since then I’ve also purchased nutritional yeast flakes which are also put on feed. Another excellent source is liquid b complex which, as others have said, you can put on mealworms, oats, or simply give orally. Other ideas are peas, and chopped up unsalted peanuts. My flock has liked both of those. You can also purchase niacin capsules (make sure NOT flush free) and mix the capsules with their water! Best of luck to you!!!