My flock is about 9 months old. They are a mixed flock. I am concerned that they are sick, because they have been a little lethargic, some of their poop is slightly foamy and yellow, and one of them is going through an out of season molt. However, I am unable to take them to a vet. Do you know what sickness they have(if they are sick)? Is it just the cold weather? Should I treat them with antibiotics? Please help!