Luckily I read other reviews and knew that these run small before I ordered them. My son wears a 6.5 toddler and I decided to give the 8/9 a chance and I am so happy I did. My husband and I are really hooked on sanuks and I knew my son would think it was cool to be like dad. They are his favorite flip flops and I already got them in the next size up for next year (on sale). I would say the 8/9 size fits more like a 6.5/7.5 so order at least one size up and your kid will love them!