Size:

Size 48cm: Suitable for 6-15 months baby, Head circumference: 48cm;

Size 50cm: Suitable for 1-3 years old, Head circumference: 50cm;

Size 52cm: Suitable for 2-5 years old, Head circumference: 52cm;

Size 54cm: Suitable for 5-10 years old, Head circumference: 54cm.