In one of the rarest and most alarming health alerts for parents from coast to coast, certain lots of ByHeart Whole Nutrition Infant Formula have been linked to an outbreak of infant botulism in 10 states. Thirteen infants ranging from two weeks to five months old—have been hospitalized since mid-August. And though there have been no deaths reported, health officials said this situation requires immediate attention and quick action by caregivers.
1. What’s Happening Right Now
Preliminary tests from California’s Department of Public Health on a can of ByHeart formula fed to one sick infant “suggest the presence” of the bacteria that produces botulinum toxin. The U.S. Food and Drug Administration and Centers for Disease Control and Prevention are investigating along with state agencies. ByHeart has voluntarily recalled two lots codes 206VABP/251261P2 and 206VABP/251131P2, both with a “Use by 01 Dec 2026” date. The formula was sold online and in retail stores nationwide.
2. Why Infant Botulism is So Dangerous
Infant botulism is rare-fewer than 200 cases occur annually in the U.S.-but it can be life-threatening. The illness is caused when spores of Clostridium botulinum germinate in a baby’s intestines, producing a toxin that blocks nerve signals to muscles. This can cause paralysis, including of the muscles used for breathing. Babies under one year old are most vulnerable because their gut microbiome isn’t mature enough to suppress the bacteria.
3. Early Symptoms Parents Need to Observe
Health experts encourage parents to look for early signs that include constipation, poor feeding, loss of head control, drooping eyelids, weak cry, and a “floppy” feel due to decreased muscle tone. Symptoms can worsen and lead to difficulty in swallowing or breathing. Dr. Erica Pan, California’s State Public Health Officer, warns: “We are urging parents to stop using ByHeart formula immediately.” If any of the above signs appear after consumption of formula, urgent care is required, and the brand and lot number should be noted before discarding the product.
4. The Only Treatment: BabyBIG
There is only one treatment for infant botulism-BabyBIG®, an antitoxin developed and distributed exclusively by California’s Infant Botulism Treatment and Prevention Program. Given by IV, BabyBIG neutralizes circulating toxin, shortens hospital stays, and reduces illness severity. Since botulism can weaken the breathing muscles, about half of infants who get botulism will need a ventilator to help them breathe. All children in this outbreak have received BabyBIG, according to the CDC.
5. Lessons From Past Formula Contamination
This is not the first time formula safety has headlined the news. The 2022 Abbott Nutrition crisis, due to contamination with Cronobacter sakazakii, resulted in the deaths of infants and subsequently widespread shortages. Past outbreaks reflect how important good manufacturing hygiene and timely recalls are. Powdered formula is not a sterile product, and contamination of Cronobacter, Salmonella, or C. botulinum origin can be quite devastating.
6. How to Protect Your Baby
Parents can minimize the risk by practicing safe formula preparation: sterilize bottles and nipples, boil water that is allowed to cool to appropriate temperatures, and discard unused formula after timeframes recommended on the packaging. Parents should never give honey to an infant under one year old since honey may contain spores of C. botulinum. Keep feeding areas clean and free from dust or soil that may harbor spores.
7. FDA’s ‘Operation Stork Speed’
The FDA has responded to those safety concerns with Operation Stork Speed, the first broad review of nutrients in infant formula since 1998. The effort will also ramp up heavy metal and contaminant testing, spur innovation in formula development, and press for clearer labeling. “Whether breastfed, bottle fed or both, the rising generation must be nourished in a way that promotes health and longevity,” said Acting FDA Commissioner Sara Brenner, M.D., M.P.H.
8. Keeping Your Cool While Caring
As experts will emphasize, while the word “botulism” is scary, prompt recognition and treatment lead to excellent recovery rates. Most infants treated early with BabyBIG recover fully within months. The key is vigilance: knowing the signs, acting quickly, and following official guidance on recalls and safe feeding.
Health officials continue to test formula samples and investigate the contamination source. Parents and caregivers should check all cans of ByHeart formula on hand, stop using recalled lots, and call their health care providers immediately if symptoms appear.
