I have a 3-4 week old chick that was fine yesterday but today is breathing heavy and lethargic. I have not see her poop today and is not eating/drinking. All other chicks are fine. Other that the issues listed above she looks good.For the last week I have been introducing them to there outside coop during the day. They have loved it. The weather here has been great. 75-85 degrees. Any suggestions as to what could have happened or what I can do to save the chick?