Asked if he's planning for more, Bolt told The Times newspaper: "No, we both agree that that's it."
Bolt also confessed he wasn't keen to be at the birth of his children but Bennett urged him to support her.
Bolt shared: "I didn't want to be there, but Kasi was, like, 'Oh, please!' My dad told me, 'Whatever happens, do not look.'
"[Did I look?] No!"
The sportsman credits parenthood for helping him to calm down and take life more slowly.
"[Parenthood] has made me much more patient," admits Bolt. "People always ask me why I couldn't coach [athletics]. I was, like, 'I'm not the patient type of guy.' [Becoming a father has] really calmed me down and let me know how to live at a slower pace."
Bolt hopes at least one of his children follows in his footsteps and forges a career in athletics.
"Yeah, definitely. I don't care who."
Meanwhile, after releasing his debut album, Country Yutes, Usain has set his sights for musical success high.
Bolt boasted: "[I'm aiming for] the highest top of top — a Grammy. That would be a big thing. So that's what we're going to work towards."