The second child of Goku already showed his talent at a young
age. He was able to turn Super Saiyajin at the age of five completely surprising
his older brother. In a Fusion with Trunks, Gotenks, they were even able to
become Super Saiyajin 3.
Unfortunately, due to his lack of discipline, he did not maintain his ability
and had to be "forced" to join the Budokai by his father.