HELP!! I am new to raising chickens and now have 4 babies that I do not know what is wrong. I will try and make this short but, cant gaurantee anything. I have 2 buff orpingtons and 2 black astralorps. They will be 3 weeks on Thursaday. They have been immunized for Mareks only (according to store). I have obsessively watched their brooder temperature 24/7, change water several times a day and do a complete cleanout about every other day or so. The orpingtons starting puffing up (I thought that it was maybe because so many feathers were coming in) about a week or so ago but, were very active, eating and drinking. They rarely have diarrhea and when they do there is no sign of blood. Now, all 4 always have puffed up/ruffled feathers 24/7. Activity, food and water consumption has diminished. They will aggressively eat and drink when I do by hand and are more active when I do this but, then they go back to being lethargic. I am treating with Corid but, now fear they have bursal disease because from looking on line they have more symptoms in common with this than cocci. Any help or advice would be greatly appreciated, I don't know what to do for my babies nor do I want them to suffer if they're gonna be goners.