US: 18M to Europe Size 68

US: 18M: Corresponds to a height baseline of 86 $\text{cm}$ (33.9 $\text{in}$), a weight baseline of 12.5 $\text{kg}$ (27.5 $\text{lbs}$), and a chest baseline of 52 $\text{cm}$ (20.5 $\text{in}$).

Europe Size 68: Corresponds to a height baseline of 68 $\text{cm}$ (26.8 $\text{in}$), a weight baseline of 8 $\text{kg}$ (17.5 $\text{lbs}$), and a chest baseline of 46 $\text{cm}$ (18.1 $\text{in}$).