The next size after kids’ size 12 is usually size 13. In some brands, the sizing then jumps to 1 after 13, so it helps to check the brand’s chart before buying.

Quick scoop

  • US kids sizes: 12 → 13 → 1.
  • UK kids sizes: 12 → 13 → 1 as well, with 13 being the last “little kids” size and 1 the first “big kids” size.
  • Best practice: measure the child’s foot and compare it to the store’s size chart, since brand sizing can vary.
Current size Next size
Kids 12 Kids 13
Kids 13 Kids 1
If you’re shopping online, I’d use the brand’s chart and size up when the child is between sizes.