Europe Size 50 to US: 18-24M

Europe Size 50: Corresponds to a head circumference baseline of 50 $\text{cm}$ (19.7 $\text{in}$) and age range 24–36 $\text{months}$.

US: 18-24M: Corresponds to a head circumference baseline of 48 $\text{cm}$ (18.9 $\text{in}$) and age range 18–24 $\text{months}$.