Why is one of my white rocks so much smaller than the other

[danimajor1988]

So I have a pair of white rock pullets that were purchased at the same time, should be the same age, possibly sharing same mother. One is huge and the other is the smallest bird I have out of 7. She is definitely the last in pecking order and doesn't seem to care so much for doing normal chicken things like playing and foraging. She mostly stands around with her eyes closed. What's going on here? Is she sick?

 

[sourland]

Her posture seems to indicate that she is not well. Whether it is a congenital problem or she is sick is difficult to determine from a picture.

 

[PippinTheChicken]

My chicks do that posture when they are a bit cold or tired. But only for a minute.
If she is always doing that, there might be something wrong

 

[MountainWoman73]

Her posture seems to indicate that she is not well. Whether it is a congenital problem or she is sick is difficult to determine from a picture.

Yes. The little one looks not likely to make it. Whatever is making her unwell is probably also responsible for the slow growth.

 

[danimajor1988]

My chicks do that posture when they are a bit cold or tired. But only for a minute.
If she is always doing that, there might be something wrong

She is mostly doing that yes, the flock will move around in the yard and she'll look up and see that they're gone and then cheep for them. I check her crop every night and some nights there's food in it an others no, but no for lack of food or food stations, the other chickens don't really harass her or pick on her or anything. It's like they know she is little and tired and they don't try to assert themselves with her. She isn't ever going after anything they want or usually fight about anyways but they don't bully her at all. Could it be failure to thrive? I noticed her feet are like a muddy yellow color and she doesn't groom herself so she looks disheveled and dirty.

 

[PippinTheChicken]

Could it be failure to thrive?

could be, I don't know much about it
make sure she is getting lots of protein, maybe put some poultry energy drink in her water