Hello, I'm an expert in footwear sizing and standards. When it comes to shoe sizes, the "C" typically refers to the width of the shoe. In the US and some other countries, shoe sizes are often categorized by width as well as length, with the letter "C" representing a common width for adult shoes.

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C is child and Y is youth. These refer to child sizes, which is the 2T-3T, etc. ... Since your son wears size 1-2 in shoe size, you should get the 13C-4Y size, which refers to size 13 in child shoe sizes up to size 4 youth shoes. see less C is child and Y is youth. These refer to child sizes, which is the 2T-3T, etc.read more >>