US: 18-24M to Europe Size 50

US: 18-24M: Corresponds to a height baseline of 86 $\text{cm}$ (33.9 $\text{in}$), a weight baseline of 12 $\text{kg}$ (26.5 $\text{lbs}$), and a chest baseline of 53 $\text{cm}$ (20.9 $\text{in}$).

Europe Size 50: Corresponds to a height baseline of 50 $\text{cm}$ (19.7 $\text{in}$), a weight baseline of 3.4 $\text{kg}$ (7.5 $\text{lbs}$), and a chest baseline of 38 $\text{cm}$ (15 $\text{in}$).