My chicks that are 6-8 weeks old shake their head all the time and i have notice a few sneezes. I'm not sure if the sneezes are a flu/cold or if it is water, dirt or chick starter food up their nose. They don't have a runny nose. I have just wormed them also. Are they in need of antibiotics or some extra vitamins. I'm in Australia and the temps are 33 degrees celcius daytime and low 20's nights.