October 29, 2015 09:00 AM

Like many new moms, Haylie Duff was eager to get moving again after giving birth to daughter Ryan Ava in May. But the Real Girl’s Kitchen star didn’t realize a little exercise would have unintended consequences — for her breast milk.

“At the two and a half, three-month mark I was like, ‘Okay, I’m ready to go back to spin and yoga and Pilates. And the minute that I started exercising, my baby fussed every time I nursed her,” Duff, 30, said in a frank PEOPLE Mom Talk video about the ups and downs of breastfeeding.

Courtesy Haylie Duff

Duff, who appears in the video alongside fellow celeb moms Soleil Moon Frye, Molly Sims and Garcelle Beauvais characterized the issue as “a real struggle” in nursing.

“[It was] the lactic acid that’s released into the milk,” she said. “So if you’re exclusively nursing, there’s no time to release that without having a nightmare child fussing.”

— Kathy Ehrich Dowd

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