I just noticed that one of my hatchlings (almost 3 weeks old) appears to have injured its foot. It was sitting in a corner by itself, puffing its feathers and peeping sadly. When another chick came over and pecked it, it stood up, holding one of its feet up. I don't see a cut and am not sure how it hurt itself. I'm wondering if it's a sprain or fracture. It looks swollen. Is there anything I can do to help it heal, or any pain medicine that would be safe for such a tiny body?