Cases of botulism tied to ByHeart baby formula have doubled since the company expanded its recall of the products early this month, according to the U.S. Food and Drug Administration.

There are now at least 31 reported cases of infant botulism associated with various lots of the ByHeart Whole Nutrition infant formula, the FDA said Wednesday. The infants were hospitalized across 15 states since Aug. 9, with the most recent case reported on Nov. 13, but no deaths have been reported.

Symptoms of infant botulism can take weeks to develop and can include poor feeding, loss of head control, drooping eyelids and a flat facial expression, the Centers for Disease Control and Prevention says . Babies may feel "floppy" and can have problems swallowing or breathing.

Despite the expanded r

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