Children's sleepwear only stays flame retardant for so many washings... and that depends on how closely you follow the manufacturer's washing instructions. The use of bleach, spot removers, Clorox II, etc, shortens the life of the retardant. Most kids wear their jammies a lot longer than the retardant lasts.
So my question is, how long does the flame resistant properties last in this batting?
I found this information on a government website a couple of years ago