At first, I ordered using the size chart provided on the listing. By that chart, my daughter is a 5/5T. When the scooters arrived, they were too small. I checked the size chart again, and had ordered the right size, so what happened? AH HA!!! The size chart with the item is a generic Amazon chart, NOT the size chart from French Toast. I exchanged them for size 6, and they fit perfectly! If you've got a standard-sized 5-year old, you need to order Size 6.