I need some help. I have a baby chick here about three weeks old who suddenly can't walk or even stand up anymore. He also sometimes opens his beak weirdly as if he had trouble breathing. I have been handfeeding him Nutribird since today with vitamins and made some sort of a hangmat so he atleast stays up instead of lying of his back/side. He still isn't improving but chirps happily most of the time. He is also tired allot.
What could be wrong with him and what should i do to help? Could it be neurological?