A 4-month-old baby in Kentucky was diagnosed with an "infant botulism" infection that led to her pupils not dilating and a loss of her gag reflex after she consumed a "cutting-edge" and "clinically proven" formula that was "laced with dangerous bacteria," a lawsuit says.

"This case arises from a parent's worst nightmare," says a legal complaint filed by Hanna Everett and Michael Everett on Wednesday in federal court in the Eastern District of Kentucky.

The Richmond couple say their daughter, Piper, was a "happy, healthy" baby before they started giving her ByHeart Infant formula. They believed ByHeart made the "highest quality" and "most nutritious" formula available after seeing advertisements saying so. This led them to buy multiple cans through Amazon.

"Plaintiffs purchased defendant

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