I always tie quilts I make with yarn. Most people use worsted weight yarn, but I use a baby or sport weight yarn.
I start by making a double length of yarn as long as I can handle without getting too many tangles. I quilt as close to even as I can sewing as much as I can with each continuous piece.
Then my husband helped cut and tie knots, (double square knots I think) since he seems to get them tighter and closer than I do.
I hope the parent’s to be love this quilt as much as I do.