A few years ago I took a plastic mirror, one of those you find in diy stores and turned it into a hanger on the baby’s bed.
I had to cut the fabric to a square and attach 2 straps to the square
while the mirror was allready sewn to it.
By attatching the straps to the square I sewed a strip of velcro to each strap.
I made 2 stages of adjusted velcros so it can be fitted to bed and to babies crib.
It’s been a few years since but I still like to sew stuff for babies.