I've searched for clue here but haven't turned up anything. I have an almost 4 month old chick who struggles with normal chick behavior, like walking, holding the head upright, tail upright, and scratching. The stomach (lower belly between legs) is distended and not soft to the touch. She has a normal feeling crop, no visible signs of other kinds. She is passing excretions normally (though somewhat small) and has a healthy appetite and thirst. She simply cannot keep up with her siblings hatched at the same time. Her hips and legs are very pronounced, in that there seems to be no muscle forming on this chicken at all. She is obviously weak but doesn't demonstrate other signs of illness/injury. She can grasp with both legs and toes. Does anyone have any ideas here? I am stumped and guessing at kidney issues.