Minkee fabric on back is 100% polyester and does not shrink, so was not pre-washed.
A sea turtle minkee back is oh so soft! A crocheted bias along the edge will make this an heirloom.
Since it is utilitarian, as well as beautiful, machine wash warm, tumble dry.
Made with love - kids are attached for years to quilts I make. I can't explain this, but I've been told often about this wonderful phenomena.