Hi I bought 8 Easter Eggers that are now almost 4 wks old. One of them has feathered out but is very small & hardly grown. I saw it moving it's head side to side and picked it up to find its crop very big and swollen. I massaged it and expelled lots if food. It's crop went back to being swollen again and doing the head thing. Question is can I do anything else or cause of its age and not growing could it be a defect in her?