US: Size 4 to Europe Size 2
Cross-market children’s diapers, nappies, and training pants apparel conversion mapping Size 4 specifications into 2.

Analyzing Size Equivalence Across Markets
US: Size 4: Corresponds to a weight range of 10–16.8 (22–37 ) and an approximate age bracket of 12–24 .
Europe Size 2: Corresponds to a weight range of 3.6–6.4 (8–14 ) and an approximate age bracket of 0–3 .