Bought this as a gift for my granddaughters baptism. Her parents were on vacation, and while visiting the BYU bookstore, they got her finger sized. (Size 3 1/2). :) There are other ways to measure your child's finger as well, but it is important to get the correct size - as this ring is not adjustable. It is much nicer than the adjustable rings of course. We felt with her turning eight years old and getting baptized, that this was the perfect time for her to have a "real" ring. She loves it! Thank you ????