I bought these for my daughter, who LOVES Crocs and has pretty normal toddler-sized feet, but the two top bands (one near the toes and the other near her ankle) were both WAAAAY too tight.  She wore them around the house for a few hours and had indentations where the straps were, so we returned them.  If we go a size bigger they would be too long for her feet, and I didn't want to make her wear them in the hopes they would stretch.  Regular Crocs fit her fine.  I guess if your kid has really thin, pancake-like feet these would be work?