Hi, what kind of light? My friend who already owned chickens years before I did was using two 60 watt light bulbs, thinking they were warm enough and he couldnt understand why he lost 30 of his 60 chicks within a week. IMO they should be on a 250 watt red light. I almost lost two babies within a day of receiving (two separate purchases- one from the feed store and one from McMurray) - they seemed to have your similar symptoms, and I ended up separating them from the rest, putting them in a separate brooder and hand feeding them chopped scrambled eggs with a little sugar water mixed in to hydrate them many times a day. I swear by the eggs and sugar water, plus if they get just the least bit cold, it will take them days to recover. My two cents, I'm a newbie, but I nursed two death bound chicks back and I'd do the same treatment again. Also, some other BYCers suggested to me, and I did it, that you put the chicks in your bra or shirt to keep them warm. Good luck!