LOUISVILLE, Ky. — The parents of at least two babies sickened in an infantile botulism outbreak are suing the makers of the ByHeart baby formula, which is at the heart of a nationwide recall.

Michael and Hanna Everett, of Richmond, Kentucky, said their daughter, Piper, 4 months, was rushed to a hospital Nov. 8 with worsening symptoms of the rare and potentially deadly disease.

Stephen and Yurany Dexter, of Flagstaff, Arizona, also said their 4-month-old daughter, Rose, had to be flown by air ambulance to a children’s hospital two hours from home and treated for several weeks this summer.

The lawsuits, filed in federal courts in two states, allege that the ByHeart formula the babies consumed was defective and that the company was negligent in selling it. They seek financial payment for m

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