The makers of ByHeart infant formula say tests of products tied to a botulism outbreak show that all of the company's products may have been contaminated.

At least 31 babies in 15 states who consumed ByHeart formula have been sickened in the outbreak that began in August.

ByHeart said it can't rule out that all of its baby formula across all product lots could be contaminated, citing recent test results.

ByHeart announced on Thursday that its own testing identified the bacterium that causes botulism in its baby formula, which is linked to an ongoing infant botulism outbreak that has doubled since last ...

The FDA said investigators “cannot rule out the possibility that contamination might have affected all ByHeart formula ...