April 24, 2015 01:00 PM

Robert Downey Jr. is clearly thrilled to have a girl.

The proud dad, 50, gave the world its first glimpse of his 5-month-old daughter Avri Roel during a visit to The Late Show with David Letterman on Thursday.

And when asked how she’s different from her siblings — the actor and wife Susan are parents to Exton Elias, 3, while Downey is also dad to son Indio, 21 — he replied with a smile, “Well, she’s female.”

Jeffrey R. Staab/CBS/Getty

The Avengers: Age of Ultron star added that Avri and Exton are getting along pretty well so far — although things can get a little tense sometimes.

“It’s natural for Exton to want to bite her once in a while,” Downey joked. “And it can start off as a little pet, and then it turns into a nibble.”

Well, you do want to eat her up.

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— Tim Nudd

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