Here's what to look for if you're wondering if a pair of pajamas has been treated:

•Check the label - The CPSC requires clear labels on kids' sleepwear. If you see a tag or a note saying "flame resistant," the fabric has likely been treated.
•Look for snug-fitting designs - If the label says "You must wear this garment close-fitting," it likely contains no flame retardants.
•Be careful with polyester fleece - These pajamas usually do not have flame retardants. This is because polyester is a man-made fabric that does not catch fire easily.
But polyester is a plastic and although it may not ignite into flames if it touches an open flame, it will melt unless there are flame retardants. Some brands describe their product as "flame resistant without any chemical treatment" because of the polyester used in the fabrication.