Heavyweight contender Adam Kownacki welcomes first child into the world

His boxing star is on the rise, but it seems like being a proud papa is making Adam Kownacki as happy as any prize fight could.

“So far the greatest feeling in the world,” said the 20-0 heavyweight, last seen besting Chris Arreola on Aug. 3 at Barclays Center in Brooklyn, in the main event of a PBC on FOX broadcast. “Especially when he gives you a smirk.”

“He” is Kazimierz Kowancki, born on Aug. 25, as an ultra mini flyweight, 8.5 pounds.

Mom Justyna gets due credit on this Labor Day, it must be noted.

OK, it’s early — but the dad duty versus being a world-class pugilist, which is harder?

“It’s the start so hard to tell,” the 30-year-old, born in Poland and now living on Long Island, NY, told Bad Left Hook. “But I think this will be harder because you are worried about someone else’s life!”