I have three 3 week old chicks. I got them from my aunt in Austin. Two of them are just perfect. One is suddenly not good. Started yesterday evening, and I just thought he ate too much. But - all day today - he just sits by himself, all puffed up and eyes closed, very quietly peeping. The other chicks were stepping on him, so we put him in a box temporarily by himself. (I keep saying he, but I really don't know if it is a he or a she, if that matters) We were able to get him to drink a little water, but no change. Please help! I don't want him to die.