Europe Size 38-40 to US: 12-24M

Europe Size 38-40: Corresponds to a head circumference baseline of 40 $\text{cm}$ (15.7 $\text{in}$), neck circumference of 22 $\text{cm}$, shoulder width of 20 $\text{cm}$, and age range 0–3 $\text{months}$.

US: 12-24M: Corresponds to a head circumference baseline of 48 $\text{cm}$ (18.9 $\text{in}$), neck circumference of 28 $\text{cm}$, shoulder width of 26 $\text{cm}$, and age range 12–24 $\text{months}$.