The measurements indicated in the size chart are the exact size of the bootie itself. To know which size would work best for your child, simply mesure his/her foot and add about 0,5in extra. Since our booties are made of natural materials, they will form to your child's feet. You can size up if you hesitate to make sure it fits longer. You'll just have to make sure the strings are attached properly for the first few weeks to make sure they don't fall off.
If you hesitate between two sizes, don't hesitate to contact us. It would be our pleasure to guide you so you can make the best size choice for your little one.