Europe Size 80 to US: 0-3M

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 $\text{in}$).

US: 0-3M: Corresponds to a height baseline of 56 $\text{cm}$ (22 $\text{in}$), a weight baseline of 5 $\text{kg}$ (11 $\text{lbs}$), and a chest baseline of 41 $\text{cm}$ (16.1 $\text{in}$).