If its not fire retardent fabric. Its going to burn no matter what whether its polyester, cotton, poly/cotton blend, unknown blend..... What about poly batting, its going to burn the same way. So whats a quilter/anyone who sews for children, adults, cats, dogs, the list goes on, to do? not sew for them. Thats the only thing to do if we are that worried about it.
And while we are at it don't use fabric softener in the wash or the dryer when doing childrens laundry because it removed the fire retardent in ready to wear clothing and PJs.
I right now am wearing a pair of 100% polyester basketball shorts, now when I was about 14 years old I witnessed a little boy who was wearing the same style of shorts get burnt the fabric melted to his skin, did it stop me from putting the same shorts on myself or on my chilren? NOPE! Maybe I am just stupid, or maybe I am optimistic. LOL
p.s. Don't make rag quilts for children they can choke on the fraying fabric! ;)
see my point?