The key to choosing a size is to measure the foot length in the size chart. Children's foot length will change after 3 months. I would rather spend an extra minute choosing a size and save at least a week of changing sizes back and forth. I also save more than 20 yuan in shipping costs. Measure your feet well. Directly compare the size chart with the [suitable foot length range] to select the size. For example, if the foot length is 15 cm, just choose size 26. Spend an extra minute and save at least a week of back and forth code changes. The allowable error of manual measurement is ET925, Nike series