<p>Fourteen-year-old Korey Mendoza (right) competes against Muhammed Ali Umar in mixed martial arts in San Bernardino, California. Before and after every competition, they must be examined by a physician.</p>

Fourteen-year-old Korey Mendoza (right) competes against Muhammed Ali Umar in mixed martial arts in San Bernardino, California. Before and after every competition, they must be examined by a physician.

Photograph by Axel Oberg

Photos Show Controversial World of Kids’ Mixed Martial Arts Fighting

Kids as young as eight can compete in mixed martial arts in California.

Sam Mendoza’s oldest son started doing competitive mixed martial arts when he was about 10. His youngest son began when he was six.

During competitions, Korey and Sammy (now 14 and 11, respectively) use moves from multiple disciplines—including wrestling, kickboxing, and jujitsu—against their opponents. Kids Sammy’s age or younger are paired against both boys and girls; but since Korey is over 12, he only spars with boys.

Kids’ mixed martial arts (MMA) is modeled after the adult version popularized by the Ultimate Fighting Championship—a sport so controversial New York didn’t legalize it until last year. (It is now legal in all 50 states.)

Although youth MMA is less well known and less brutal than its grown-up inspiration, it too has faced

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