What size is 12 in Mexico kids shoes?

What is this? Mexican children’s shoe sizes begin at size 9, which corresponds to a US size 1 measuring 3 ⅝ inches (9.2 cm). And the shoe sizes for kids usually range from 10, 11, and 12 to 24, which is equivalent to a size 6Y or 9 ¾ inches (24.7 cm)in the United States.