I hatched out little Nan and another under a broody and bought two more form the farm store. They are all within a day or two of each other in age and all different breeds, but Nan the RBLW has stayed tiny. She's not as feathered out, almost the size she was out of the egg, and seems to only be able to walk/stand for a few seconds. The last part is new, she was up and walking around fine the last couple of weeks. She is eating and drinking and pooping a little, not pasted up. She does shake her head every once in a while. I'm thinking maybe heart problem as she is now about half the size of the others. Thoughts?