The death of Anucha Tasako came after a Muay Thai -- Thai boxing match Saturday in the Bangkok suburb of Samut Prakarn. The Facebook page Muaythai Krobwongjorn, which covers the sport, said he died from a brain hemorrhage.
Protective gear is normally not worn in the sport, and video circulated on social media said to be of the fight shows Anucha not wearing any.
Child boxing is widespread in Thailand, especially in rural areas, where it offers a way for children to help provide for their families and a path to lift them out of poverty.
Opponents say the sport is dangerous, citing studies such as one published last month by Thailand’s Mahidol University saying that allowing children under 15 to box could result in various types of brain damage.
Thai lawmakers are considering legislation proposed last month banning children under 12 from competitive boxing. The legislation has been forwarded to the Ministry of Tourism and Sports, which has already drafted a revised version, said Gen. Aduldej Intapong, a member of the National Legislative Assembly.
Kickboxing is one of the most popular sports in Thailand and its boosters oppose regulating it.