ByHeart, a maker of organic baby formula, expanded a voluntary recall Tuesday to include all of its products sold nationwide after federal health regulators found botulism infections in two additional infants, bringing the number of reported cases to 15.

The expanded recall was announced days after the Food and Drug Administration told caregivers to stop using two batches of ByHeart’s powdered Whole Nutrition Infant Formula after health agencies found an increase in the number of botulism infections in infants who had consumed it.

The FDA said Saturday that 13 infants had been hospitalized in 10 states. On Tuesday, the agency asked ByHeart to expand the recall to include all of its powdered formula after the number of hospitalized infants rose to 15 in 12 states. The infants, who are bet

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