I bought the size 6.5 they have them on See Kai Start, for the foot, the website recommends 5 1/4 inches (which is exactly what my kid has). He previously wore a Pediped size from 18-24 months (meaning a 5.25 inch inner shoe length). CONS: They are a little big, my child sometimes stumbles in them for the first few days of wearing them. See how Kai Ran says in the sizing chart that her shoes grow with you, so they might need to be a tad bigger (maybe going down a size would be too small, who knows). PROS: I bought them because they are recommended by the orthopedic association. The outsole flexes and twists very easily, so I'm happy with that.
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