Each item is carefully measured. Please measure your baby's/child's wrist for bracelet size and ankle for anklet size. Many items have extensions and can be shortened and lengthened. Approximations for age are given if you are unable to do this (as in when buying a gift). Obviously babies and young children vary a lot in size for their age, but if you buy an item that is too big or too small, please return it for replacement with a more suitable size/item.