Well, first, my grandchild isn't even born yet, so playing with matches is doubtful for a long time. Plus, it was really not about mischief with matches, but about the unplanned house fire that make me even ask this question.
I agree totally about chemicals, and had planned 100% cotton quilt because that is all I have worked with.
Then I read the ad about flame retardant batting, and of course know that purchased children's sleepwear is flame retardant.
So wondered if this was an issue that I had somehow missed. And wondered what others do.