Just this morning one of my 2 wk old chicks can't walk, stumbles flaps wings and falls over on bottom. It will eat and drink when I hold it to the water and food. Not sure breed, was told possibly Easter egger or ameracuna. Brought it inside to separate. Eating chick starter/grower non medicated. ACV in water every other day for 8 hrs a day about. Bought chicks Saturday. Some had crusty butt but fixed that and no other birds showing symptoms. I've read they are too young for mareks disease? But still a newbie second round of chicks and first illness so I'll take any and all advice please!