I have four 3 week old chicks hatched by their broody mom (two are Gold Laced Cochin, two are Cochin/Australorp cross). All have been fantastic and mom has them out free ranging and they have been interacting with the rest of the flock without incident. They still sleep with mom in the dog crate where she hatched them, but the crate is in the run. Suddenly this afternoon, I noticed one of the Cochin chicks apart from mama and the other 3. She was just sitting quietly, but not moving when mom called for a goodie (grasshoppers). I noticed a little caked poop and that she seemed to be straining a bit to poop. I cleaned her bottom up and saw her poop a bit a few more times. She is not interested in eating. She just gets to a safe place and then when mom and the other 3 move too far away, she runs to catch up but then just plops down. They have been eating medicated chick starter plus free ranging. I don't know if something she ate is disagreeing with her or if she might have some illness. Sure would appreciate any help.