Available sizes: newborn, 3-6 month, 6-12 month, 12-18 month, 2-4 year, 5-8 year, 9-12 year and adult. The hats are designed to fit average sized head in the age group. If your child's head is larger or small than average, go up or down a size accordingly. The hats are made in the USA using 100% cotton yarn.