I have a week old "Americana" that stoped chirping.

[C beast]

Do you have any idea of what

 

[chicken_fun]

It is one of the essentials of survival for a chick, and they can easily die from the cold. Make sure the chicks are comfortably warm and not too cold nor too hot. Also discomfort, usually chicks tend to chirp more though, but i would look into it.