Size S :
Hat: Circumference is 47-50 cm
It fits for the baby age 1 years to 3 years old
Size M :
Hat: Circumference is 49-52 cm
It fits for the baby age 4 years old to 6 years old
Size L :
Hat: Circumference is 51-54 cm
It fits for the baby age 7 years old to 12 years old
