Gotoole Baby's Casual Sandal T Strap Sandal Different kids in the same age stage have different Size.The age is just a suggstion,please kindly check the size details before you buy it . Suitable Age0-6 Month-------Length:4.1inch-------US:2.5 Suitable Age6-12 Month-------Length: 4.5inch------- US:3 Suitable Age 12-18 Month-------Length: 4.7inch------- US:4 Material of shoes:Cotton fabric