Please make sure to confirm the size before purchasing.Not every pair of shoes is in standard sizes.The inner length of the shoes is measured manually, and there may be a reasonable error of about 0.5cm Regarding the selection of children's shoe sizes, please note the following: Most children's shoe sizes are based on manufacturer's standards and do not have a unified standard (different shoes of the same size may have different dimensions). Please measure the foot length. For summer models, it is recommended that foot length + 0.5cm = shoe inner length. For spring/autumn and winter models, it is recommended that foot length + 1cm = shoe inner length (the cm indicated after each size is the shoe's inner length) Size 21: Inner length 13.5cm cm. Size 22: Inner length 14 cm. Size 23: Inner length 14.5cm cm. Size 24: Inner length 15 cm. Size 25: Inner length 15.5cm cm. Size 26: Inner length 15.8cm cm. Size 27: Inner length 16.2cm cm. Size 28: Inner length 16.8cm cm. Size 29: Inner length 17.5cm cm. Size 30: Inner length 18.2cm cm. Size 31: Inner length 18.6cm cm. Size 32: Inner length 19.2 cm. Size 33: Inner length 19.7 cm. Size 34: Inner length 20.3 cm. Size 35: Inner length 21 cm. Size 36: Inner length 21.6 cm. Recommended foot length +1 cm = shoe inner length null null null