I purchased these for my daughter who typically wears a size 1. As suggested, I ordered 1 size up. They were so incredibly small she couldn't even fit her toes into them - much less the rest of her foot. (She does not run wide.) Will return and try an alternative brand because customer service could not give me any sizing measurements to ensure better fit for this shoe. On another note, the construction and lining seemed very nicely done and the color was beautiful. Disappointing we couldn't make these work.