The law requires the warning. This law came about because of a very vocal mother who used RAYON pjs, with the predictasble results. For any who do not know, Rayon is virtually an explosive waiting for any spark. My father demo'ed this for me when I was a small person, but until the law changed (and manufacturers lost lawsuits) rayon was regularly used for baby clothing. The flame retardants are also carcinogens, but let's not go into the logic of that one.