Starr Cookman (left) and Kylee Moreland Fenton (right) have been best friends since they were children—even trying to become blood sisters. And today, they remain just as close, living on the same street as each other with their families.

Kylee is a nurse and soon after Starr’s son Rowan was born, he began breathing rapidly and spitting up food. This concerned Kylee and she recommended getting him to a doctor immediately. It turned out there was something wrong with his heart and he was rushed into surgery, saving his life.

At StoryCorps, Starr and Kylee discuss the bond between them that has only grown stronger over time.

Originally aired October 18, 2013, on NPR’s Morning Edition.