US: 9-12M to Europe Size 80

US: 9-12M: Corresponds to a height baseline of 74 $\text{cm}$ (29.1 $\text{in}$), a weight baseline of 9.3 $\text{kg}$ (20.5 $\text{lbs}$), and a chest baseline of 49 $\text{cm}$ (19.3 $\text{in}$).

Europe Size 80: Corresponds to a height baseline of 80 $\text{cm}$ (31.5 $\text{in}$), a weight baseline of 11 $\text{kg}$ (24.2 $\text{lbs}$), and a chest baseline of 52 $\text{cm}$ (20.5 $\text{in}$).