Speaking to Harper's Bazaar, the Killers actress revealed that her baby girl underwent the surgery before leaving her native Korea.
"Her heart is 100% fine now. She has a scar, so she won't be wearing bikinis, which is fine by us," Heigl said.
She added: "A lot of children don't find forever homes because they're on that special needs list, even if it's because of something as simple as her mother smoked cigarettes for a month, not knowing she was pregnant. That's not so huge that you couldn't handle it."
The 31-year-old and husband Josh Kelley announced their plans to adopt their daughter last September.