I have one chick (~ 3 weeks old) that I named Nugget that I'm really worried about. S(he) hasn't grown like the rest of the flock and is extremely wobbly. Nugget is eating and drinking but sways back and forth and has really poor mobility. Nugget doesn't seem to want to lay down and sleep, is always hunched standing up, and shaking. We have isolated Nugget and should be plenty warm under the heat lamp. Nugget is constantly chirping really loud, telling us something is wrong. The hatchery vaccinated against Marek's so I don't think that's the issue but I don't know what the problem is and if there is anything we can do to help Nugget get healthy. Thanks for your help!