January 25, 2015 09:30 AM

Evan Agostini/AP

It’s no surprise Ryan Reynolds is more than willing to share baby duties with wife Blake Lively, but we weren’t expecting him to be so involved.

“I gotta jump in and do all those sorts of things,” Reynolds, 38, told PEOPLE Saturday at the party for his new film, Mississippi Grind, at the Chase Sapphire on Main during the Sundance Film Festival in Park City, Utah.

He jokes, “I mean, I’ve even tried breastfeeding.”

So how did that go for all involved?

“It’s frustrating for the baby and frankly disturbing for me … not well is the answer,” quips the actor, who plays a charismatic nomad in the movie.

In all seriousness, since welcoming a daughter with Lively, 27, in December, life at home has been “great.”

“It’s amazing that you can be that exhausted and that happy at the same time,” says Reynolds.

— Melody Chiu

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