Size Guide:

Small - 18cm - 23cm
US Size Range: 3Y-5Y, W 4-6
UK Size Range: 1.5Y-3.5Y, W 2-4

Medium - 23cm - 26cm
US Size Range: 5Y-7Y, W 6-10, M 6-8
UK Size Range: 3.5Y-5.5Y, W 4-8, M 5-7

Large - 26cm - 31cm
US Size Range: W 10-13, M 8-12
UK Size Range: W 8-11, M 7-11