Living with a fire fighter I come at this issue from a different perspective. I would (and do for all of my quilts) stick with 100% natural fiber (cotton; wool; silk) as these fibers will burn vs melt onto the person's skin. I have also, sadly, been privy to info regarding folks involved in propane fires and particularly those wearing synthetic clothing. It is those fabrics/fibers melting into the skin of the burn victims that creates the most serious burns.
For baby or any other quilts I make - 100% natural fibers.