US: 3-6M to Europe Size 44-46

US: 3-6M: Corresponds to a head circumference baseline of 42.5 $\text{cm}$ (16.7 $\text{in}$), neck circumference of 24 $\text{cm}$, shoulder width of 22 $\text{cm}$, and age range 3–6 $\text{months}$.

Europe Size 44-46: Corresponds to a head circumference baseline of 45 $\text{cm}$ (17.7 $\text{in}$), neck circumference of 26 $\text{cm}$, shoulder width of 24 $\text{cm}$, and age range 6–12 $\text{months}$.