US: 2-W to Europe Size 16

US: 2-W: Corresponds to a foot length of 10 $\text{cm}$ (3.9 $\text{in}$), ball width of 4.8 $\text{cm}$ (1.9 $\text{in}$), grade Wide (2E), growth margin 0.6 $\text{cm}$, estimated age 6-9m, Mondopoint 100 $\text{mm}$, and fit type Infant Wide (US 2 / Width 2E).

Europe Size 16: Corresponds to a foot length of 8.5 $\text{cm}$ (3.3 $\text{in}$), ball width of 3.8 $\text{cm}$ (1.5 $\text{in}$), grade Narrow (B), growth margin 0.5 $\text{cm}$, estimated age 0-3m, Mondopoint 85 $\text{mm}$, and fit type Infant Narrow (US 0 / Width B).