I have 6 chicks that are about 3 weeks old. In the last 12 hours I would say 2 or 3 of them have started sneezing. I did raise their heat lamp and am worried maybe hey got to chilled while I was at work. I am also feeding them unmedicated chick starter is medicated better? These are my first chicks and I am very worried that it will quickly spread to the others. Any help is greatly appreciated!