As health officials investigate more than 30 cases of infant botulism linked to ByHeart baby formula since August, parents who say their children were sickened with the same illness months before the current outbreak are demanding answers, too.

California public health officials confirmed late Friday that six babies in that state who consumed ByHeart formula were treated for botulism between November 2024 and June 2025, up to nine months before the outbreak that has sickened at least 31 babies in 15 states.

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