Carey Mulligan Says She Filmed “The Ballad of Wallis Island” with Her Newborn Daughter on Set: 'It Was Kind of Lovely' (Exclusive)

The actress spoke to PEOPLE at the Sundance Film Festival on Saturday, Jan. 25

Cindy Ord/Getty Carey Mulligan at 'The Ballad Of Wallace Island' premiere during the 2025 Sundance Film Festival at Eccles Center Theatre on January 25, 2025

Cindy Ord/Getty

Carey Mulligan at 'The Ballad Of Wallace Island' premiere during the 2025 Sundance Film Festival at Eccles Center Theatre on January 25, 2025

Carey Mulligan made filming her new movie a family affair.

Speaking exclusively to PEOPLE at the Sundance Film Festival on Saturday, Jan. 25, the actress, 39, who shares three children with her musician husband Marcus Mumford, spoke about how she balances parenting with work.

Mulligan, who plays the role of Nell Mortimer in the upcoming film The Ballad of Wallis Island, revealed she brought her third baby to set after giving birth.

“When they sent it to me, I said I'd love to do it, but I will have like a 12-week-old baby,” she tells PEOPLE. “And they were just amazing.”

Mulligan, who has not revealed the name of her daughter, adds, “She came with us. She was upstairs in every house that we filmed in and I would just do the scene, go up, see her, feed her, and then come back down.”

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“So they made it incredibly easy and it was kind of lovely,” the Promising Young Woman star says.

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Gilbert Flores/Variety via Getty Images Carey Mulligan at the premiere of 'Spaceman' at The Egyptian Theatre Hollywood on February 26, 2024 in Los Angeles

Gilbert Flores/Variety via Getty Images

Carey Mulligan at the premiere of 'Spaceman' at The Egyptian Theatre Hollywood on February 26, 2024 in Los Angeles

Related: Carey Mulligan Is Whisked Away by Her Husband Marcus Mumford After the 2024 Oscars

Mulligan welcomed her third baby with Mumford in October 2023.

Confirming the news in an interview with Vogue, the journalist mentioned that Mulligan was six weeks postpartum at the time of the interview and she made a "bemused gesture at the yellow diaper-leak stain streaked across her blouse."

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Jenny Anderson/Disney via Getty Marcus Mumford and Carey Mulligan at the Oscars on Sunday, March 10, 2024

Jenny Anderson/Disney via Getty

Marcus Mumford and Carey Mulligan at the Oscars on Sunday, March 10, 2024

Related: See Adam Sandler, Carey Mulligan and More Stars Arriving at the Spaceman Premiere in L.A.

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Carrying her baby, Mulligan then said to her daughter, "I'm going to change you, and then we're going to find Mum another shirt."

The mother of three then revealed the sex of her baby the following month at the 2023 Variety Power of Women Los Angeles gala.

Speaking to Entertainment Tonight, she revealed she welcomed a baby girl.

"Oh, she's great. Great. Good baby, 10 out of 10 so far," she said at the time, adding a thumbs up. "We'll see how long that lasts."

Mulligan and Mumford, who married in 2012, are also parents to daughter Evelyn Grace, 9, and son Wilfred, 7.

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