US: Newborn to Europe Size 44-46

US: Newborn: Corresponds to a head circumference baseline of 36 $\text{cm}$ (14.2 $\text{in}$), neck circumference of 20 $\text{cm}$, shoulder width of 18 $\text{cm}$, and age range 0–1 $\text{months}$.

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 $\text{months}$.