My 10 chicks are in a warm Brooder. Paper towels for substrate. Cleaned 4 to 5 times a day. On starter feed only. Water and electrolytes. Today I noticed that one of my smaller chicks was squinty eyed. When I checked her, I noticed that her abdomen was swollen. I had already fed and believe everyone are but not 100% sure. I am sure that she drank and had normal poop today. Clean vent and nares. Breathing slightly increased and slight click sound heard. I have separated her for monitoring and gave more water/electrolytes. What could it be? Any advice on how to help? Thanks in advance!