US: 12-24M to Europe Size 21-23
Cross-market children’s socks, tights, hosiery, leg warmers, and dance tights sizing conversion mapping 12-24M specifications into 21-23.

Analyzing Size Equivalence Across Markets
US: 12-24M: Corresponds to a foot length of 13.5 (5.3 ), matching US shoe size 5-7, and age range 12–24 months.
Europe Size 21-23: Corresponds to a foot length of 13.5 (5.3 ), matching US shoe size 5-7, and age range 12–24 months.