“Boy Meets World” star Danielle Fishel says she experienced a massive amount of “mom guilt” after her own breast milk harmed her newborn son.

In an essay for “Good Morning America,” the 38-year-old actress revealed her months-long struggle, which began with the premature birth of her son, Adler, in June and the discovery of fluid in his lungs.

“I went into labor more than four weeks early and my doctor discovered fluid in Adler’s chest cavity,” she explained in the essay. “Immediately after delivery, Adler was given a feeding tube so we weren’t able to breast-feed the way I always envisioned, but we were able to feed him breast milk through the tube.”

However, Fishel explained that as her son was treated in the neonatal intensive care unit at Children’s Hospital Los Angeles, her breast milk only added more fluid to his lungs, causing further complications.

“The guilt arrived with gusto,” she said. “‘Why is my milk hurting my child? Is my baby allergic to me? Formula is bad for him because it’s full of high fructose corn syrup. This is all my fault.'”

Doctors told Fishel that Adler would likely grow out of it, so he was put on a medium-chain triglyceride formula in the meantime.

Though her dreams of a natural pregnancy were no longer a reality, she was determined to breast-feed her child, so she tried again after doctors gave her the green light when Adler was six weeks old. However, a follow-up X-ray four weeks later showed the fluid had come back, so he went back on baby formula.

“Of all the experiences we’ve had with Adler’s health, for some reason, not being able to feed him from my body has been one of the most emotional for me,” she added.

Fishel described herself as an “emotional wreck” during this time, but her struggles with breast-feeding gave her a new perspective on motherhood and the guilt new mothers often feel.

“None of us escape mom-guilt. It’s there whether you’re a stay-at-home mom or work outside the house, but there is one thing I know for certain each and every mother has in common: We are trying our absolute best 100% of the time,” she wrote.