No thick batting!!! Fire retardant fabrics only!! A thin quilt is the key for newborns, achieved by close quilting and low loft fabrics for top, batting, and backing. Maybe a flannel or cotton batting. The danger is that a newborn could easily bury his head in the quilt and suffocate (even though most doctors tell new mothers today NOT to lay new babies on their stomach).
How about suggesting that new mommy let baby sleep on top of the quilt (not under it) until he's old enough to flip over at will.
Save the big fluffy quilt for later.