How do kids belts work in BJJ?

The kids belt system was designed to provide more frequent recognition for younger practitioners whose attention spans and motivation patterns differ from adults. Starting at around age 4, kids begin at white belt and progress through grey (with white, solid, and black stripe versions), yellow (same three versions), orange (same three versions), and green (same three versions). This gives approximately 13 possible ranks before transitioning to adult belts. When a teenager turns 16, they typically receive the adult equivalent of their kids rank. A green belt usually translates to blue belt, though this varies by instructor. Kids cannot receive a purple belt until at least age 16, and brown belt requires a minimum age of 17 under IBJJF rules. Some prodigies who started very young and trained extensively may receive their blue belt at 16 with skills beyond many adult blue belts due to years of accumulated mat time.