Tests show that whole milk powder could be the cause of the botulism outbreak linked to ByHeart Whole Nutrition infant formula.[1] In the US, as of November 26, 2025, 37 infants were registered with confirmed or probable botulism after consuming this formula.[1] The FDA confirmed the recall of two lots, later expanded to all unexpired products.[1][3] Epidemiological and laboratory data indicate possible contamination with the bacterium Clostridium botulinum.[1] ÚVZ SR warns against consuming ByHeart Whole Nutrition and recommends immediately stopping its use, including all batches.[1][4][5] Parents should watch for symptoms such as constipation, difficulty feeding, poor crying, droopy eyelids, or lethargy and seek immediate medical attention.[3] The manufacturer ByHeart calls for the disinfection of surfaces and tools that have come into contact with food.[3] The product was sold online through platforms such as Amazon, available worldwide.[4]