It runs about a size too big. My daughter is wearing size 2 but this one kinda fit like a 3. I wear 5-5.5 in women's and can fit into kids 3.5, this sandal almost fit juts right. It's my first time buying this brand and I will recommend because it is really comfortable. i will be buying a smaller size for my daughter because she thought they were super comfy and she really liked the color.