Yutthana Kaensa, nicknamed Stamp, was born in Lao Suea Kok District), Mueang Ubon Ratchathani District, Ubon Ratchathani province, and is a cousin of Poonsawat Kratingdaenggym, a former WBA Super bantamweight world champion.
[3] He won the WPBF Light flyweight title by wins over fellow-countryman Kwanthai Sithmorseng, a former WBA Minimumweight world champion on August 8, 2014, at Sanam Luang, Phra Nakhon District, Bangkok, and on September 23 of the same year he won the WBA Asia Flyweight title by wins over Samuel Tehuayo, an Indonesian boxer at Ayutthaya City Park, Ayutthaya province.
On July 29, 2015, he won the WBA Flyweight interim title by wins over Gregorio Lebron, a Dominican contender at Loei province and he defended it once with the old rival Gregorio Lebron at Bangkokthonburi University, Thawi Watthana District, Bangkok, on February 9, 2016.
[3] On December 31, 2016, he challenged WBA Flyweight world title Kazuto Ioka, a Japanese holder in the elimination fight at Shimazu Arena, Kyoto, Japan.
[3] On May 18, 2018, Kiatniwat defeated TKO with left punches just the second round for the Filipino contender Jaysever Abcede at Bangkokthonburi University to lose WBA Asia Flyweight title.