chicks with dificults breathing

[muus]

My two pheasants have 3 weeks, and this last week start having breathing problems. They open their peak and breath closing their eyes. They don't do this all time, when I have him in my hands, they do it, and when they aren't doing anything. When i take them over for a walk with their "brothers"(2 peachiks and 1 partridge that they breath well) they breath good.
I had a cuturnix quail that had the same problem, and 2 weeks later died. I don't want my chiks die, I apreciate them a lot, they follow me everywhere and when I'm not with them, they make noise.
Please, help me and hel them.

Thanks

 

[muus]

Anyone can help me in this? I'm very worried.