They left their two-month-old with me while they went shopping. But his desperate crying wouldn’t stop. I checked his diaper and what I found made my hands tremble. I grabbed him and rushed to the hospital.

When I was allowed back in, the baby was calmer, his skin treated with special cream and protected with a soft bandage. I held him close, both relieved and deeply shaken.

Moments later, my son and daughter-in-law rushed in, pale and breathless. I explained everything as calmly as I could. They felt terrible, but the doctor assured them that allergic reactions like this are unpredictable, even for the most attentive parents.

We thought the ordeal was over—until the doctor returned with another serious look.

“There’s something else we need to discuss,” he said.

My stomach dropped.