US: 3-6M to Europe Size 35-37

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 35-37: 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 $\text{months}$.