My chicks are about 5 weeks old now and I've noticed that they sneeze now and then. They don't do it often, but enough to get my attention. Their not loud, the only reason I notice is that they shake their head. One of my chicks is also stretching its neck out and opening its beak a few times in a row. Its been getting colder down here, and we've also been sawing wood on occasion. Also, no one sells pullet finisher in my area. How would I go about changing their feed when their older?