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ByHeart formula infected at least six babies with botulism between November 2024 and June 2025, months before the current outbreak, California health officials say.

Federal health officials say they cannot definitively link these early cases to the recent surge of infections.

Food safety experts argue that the earlier cases should count toward the outbreak total, raising questions about investigation delays.

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 offici

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