I had 4 silkie chicks and now down to 1. They had been having trouble breathing and would breath with their mouths open like they where gulping for air. Now the last one is still trying to gulp for air and his eyes are like glued shut! He won't open them! He is around 2 months old. I had to put my new 2 week old chicks in the same pen and now one of them is breathing with his mouth open! I don't want anymore to die! I am think that it some kind of upper respiratory infection. Does anyone know what this is or what to do to help them??