US: Newborn to Europe Size 86

US: Newborn: Corresponds to an age bracket of Newborn (0–1 month) (approx. height baseline of 50 $\text{cm}$ / 19.7 $\text{in}$), a head-and-neck opening circumference baseline of 14 $\text{cm}$ (5.5 $\text{in}$), a length baseline of 16 $\text{cm}$ (6.3 $\text{in}$), utilizing soft hypoallergenic stretch standards designed for infants, toddlers, and youth.

Europe Size 86: Corresponds to an age bracket of 18–24 months (1.5–2 years) (approx. height baseline of 86 $\text{cm}$ / 33.9 $\text{in}$), a head-and-neck opening circumference baseline of 21 $\text{cm}$ (8.3 $\text{in}$), a length baseline of 33 $\text{cm}$ (13 $\text{in}$), utilizing soft hypoallergenic stretch standards designed for infants, toddlers, and youth.