This is "Runt" She is lagging far behind his siblings in terms of development. She initially had something wrapped around her leg, constricting it. That has been corrected, and behaviorally she is doing fine --s he eats, explores, poops, etc. like normal, although she is a really skittish chick. But she seems really stunted in the development process. She is about 5 weeks old, and just has these measly wing-tip feathers. Her siblings are fully feathered out now. Any ideas if/what is wrong? Anything to be worried about?