I printed out the Robeez size chart and measured my daughter's foot before purchase, she is between 3-6 months (size 2) and 6-9 months (size 3 ) measured her table. I originally ordered for 3-6 months because other reviews said how big they are. WRONG (3-6 months) was tight on her leg and her toes were all the way up so I went ahead and ordered the next size up (6-9 months) and it's HUGE! They are very wide on their foot, leaving at least 1 inch from their toes to the top of their shoe. I also aligned them to the soles of two other brands of shoes I have for them and they are a size 4 (Gymboree & Old Navy) and they were about 1cm longer, although the packaging says these shoes are a 3. size are!
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