Material: Cotton 5 pairs/Lot 2-3T:suit feet length 12-14cm Age 2-3Y 4-6T:suit feet length 15-17cm Age 4-6Y 7-9T:suit feet length 18-19cm Age 7-9Y 10-12T:suit feet length 20-22cm Age 10-12Y Please measure the baby's feet length so that you can choose the correct size. Please allow 1-2cm differs due to manual measurement,thanks.