Last week, tabloids floated the rumor that Gwen Stefani and Gavin Rossdale's 2½-year-old son, Zuma (big brother is 5-year-old Kingston), was rushed to a hospital with a broken arm.

Now Rossdale has confirmed that a sudden, accidental fall off a kitchen counter in the family's Beverly Hills home injured the toddler. The doting dad told, "It was one of the worst nights of our lives."

Rossdale did not confirm insider reports that Zuma's treatment included insertion of a pin into the child's wrist.

Stefani's husband said, "It was one of those freak events. He fell. A freak accident." And how is Zuma? "He's fine now...The kids are never alone, and you turn your back, and it takes a split second."

Calling the event "horrific," the 45-year-old explained, "It's almost worse for us [parents]."