The Snow White and the Huntsman star and his wife Elsa Pataky welcomed their daughter India Rose last month.
"She's been great," Hemsworth told Us Weekly. "She sleeps very well. Not out of any skill on my behalf, but my wife has been amazing."
Hemsworth added that the best part of fatherhood is "just her being here" and continued: "It's certainly taken all my focus and attention away from work or what have you, but that's the main thing on my brain right now."
He also revealed that he changes India's dirty diapers, joking: "You don't change clean ones, do you?"
Hemsworth's younger brother Liam Hemsworth recently got engaged to his girlfriend Miley Cyrus.