After reading many reviews about sizes not being true to size, I decided to order more than I thought I would need. My son wears US size 3 shoes (3-6 months) and I ordered a 12 month size, it is a US size 4 or 6-12 months. The size seems right to me, he has room to grow. You can see the flex in the toe at a glance, it has that much room. Soft, high quality shoes, time will tell if they are durable.
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