US: 3-6M to Europe Size 80

US: 3-6M: Corresponds to a height baseline of 62 $\text{cm}$ (24.4 $\text{in}$), a weight baseline of 6.5 $\text{kg}$ (14.3 $\text{lbs}$), and a chest baseline of 44 $\text{cm}$ (17.3 $\text{in}$).

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 $\text{in}$).