Many years ago a law was passed requring all children's sleepwear to have a flame retardent put on it. A second law was passed requiring fabric that did not have flame retardent be labeled that it was not safe to use for children's sleepwear. The law requiring flame retardent was done away with, but the law requiring labeling was not. If you conduct a burn test on 100% cotton pjs bought in any store and 100% cotton fabric from a fabric store you will find they burn exactly the same.
The labeling did accomplish one thing - it made us think about fire danger.