Kourtney Kardashian is sharing more insight into her and Travis Barker‘s 7-month-old son’s health.

The Kardashians star opened up about the reason she underwent emergency fetal surgery during her pregnancy in September, sharing in the June 20 episode that there was fluid in Rocky Thirteen Barker‘s lungs.

“We had a terrifying scare,” she said. “It’s super rare—the condition that he had—but it’s also super rare and lucky that we caught it. Thank you, God, for a successful surgery. I’m honestly just so grateful, I have no words.”

And although the operation went well, Kourtney said she was “filled with fear” following the procedure and when Rocky’s symptoms returned.

“The fluid in his lungs actually did start coming back,” the 45-year-old explained in a confessional. “Then I watched this documentary called Heal that was all about the power of positive thinking and how our thinking can really affect our health.”

The Poosh founder was inspired to change her outlook and hope for the best.