I took him to see the specialist again yesterday, they finally found out what's wrong. She told me that because Alfred was the smallest and weakest of the clutch, he's basically a runt and in general is more susceptible to illness, only he isn't 'ill'; he doesn't have a disease but he does have a condition, a problem with how well his body absorbs nutrients. I told her everything in his diet, how he started on chick feed, then onto complete premium grain with added vitamins and minerals, fresh chopped and sometimes mushed vegetables, the grass he nibbles and the bugs he finds outside, she told me for a diet like that he just can't be getting all the goodness out of it, she gave me baytril for a minor chest infection and a multivitamin for his water, she thinks he should improve although I shouldn't get my hopes up that he'll ever go back to how he was when he was healthy, that he could live a good and happy life still, but to be prepared that I could wake up one day to find him dead. She also told me it's a good job he hasn't been living in a coop outside as even a mildly cold night could kill him, now I know why every time I take him out he doesn't want to be out for very long before he'd come running to my feet crying to be picked up. I haven't stopped crying, I fell asleep on the floor with him last night, but when I woke up he was clucking softly with his head in my hair, after these recently horrible days it was such a perfect moment; I just can't believe this is happening to my baby, utterly helpless that I can't take it all away. Thankyou everyone for your support and advice, I've got him on chick crumbles, mealworms, grains and his vitamins, he seems weak but is very alert.