One of my week and a half old RIR chicks was acting odd today. I had taken all 8 of the little 'uns out on the lawn, and all of them except that RIR seemed to enjoy themselves immensely. The RIR just sat with her eyes closed and her wings drooping.
I picked her up... her crop felt firm and rounded but not overly distended... I felt a few other chicks' crops and theirs felt the same, so I don't think it's impacted crop. She did poo while we were out and the poo looked fine.
She kind of acted like she was hurt somehow and didn't want to move.
She seems okay, but just has no energy. She's also doesn't seem to be as big as the others, although she's feathering out at the same rate. She doesn't feel as heavy in my hand as the other chicks do.
Any ideas as to what I can do?
I picked her up... her crop felt firm and rounded but not overly distended... I felt a few other chicks' crops and theirs felt the same, so I don't think it's impacted crop. She did poo while we were out and the poo looked fine.

She seems okay, but just has no energy. She's also doesn't seem to be as big as the others, although she's feathering out at the same rate. She doesn't feel as heavy in my hand as the other chicks do.
Any ideas as to what I can do?