I assumed these chicks were misvaccinated on Day Old, because no such clinical sign of any disease on day old chicks. Epidemic tremor of Avian Encephalomyelitis ? Naaaah, I don't think so.
And This? This poor chick had a defect on the beak, not sure whether this is congenital, but could propably an accidentally hurt at the de-beaking process ( They should be more careful at doing that). I tried to manually feed this chick for 2 days, but she couldn't make it.