We recently bought several baby chicks that are 2 weeks old now. Most of them are thriving. But we have 4, Salmon Favollres and Buff Rocks, that are just off. They can't stand for very long on their own. When they do the wobble a few feet and fall down. They are listless. It started a week ago with 1 Salmon Favollres and it seems like every other day a new one pops up with it. We have Red Stars, Barred Rocks and White Rocks that are doing fine. We fed the quick chick starter, Purina Startena, we have the on pine shavings with a heat lamp and heater. We change their water and feed twice a day and monitor the environment. My husband has raised chickens for 30 years and has never had this problem. It even stumped the lady at Murray McMurray (who offered to replace them). We just want to know what it is and how we can stop it and make the sick ones well. Thanks.