How to define the right shoe size?
 
It's best to place both children's feet on a piece of paper and draw with a pencil outside the feet. Make sure that each foot is fully extended and double check that your child’s toes aren’t curled. Please measure from the heel to the longest toe and add a tolerance of 0,5 cm or 1.0 cm. Now you can choose a size from the chart.

EU Size Age Foot Length Sole Length Sole Width
18/19 - S 0 - 6 mos up to 11,5 cm 12 cm 5,8 cm
20/21 - M 6 - 12 mos up to 12,5 cm 13 cm 6 cm
22/23 - L 12 - 18 mos up to 13,5 cm 14 cm 6,3 cm
23/24 - XL 18 - 24 mos up to 14,5 cm 15 cm 6,5 cm
25 - XXL 22 - 28 mos up to 15,2 cm 15,7 cm 7 cm