51 Cases Span 19 States (Image Credits: Unsplash)
A multi-state surge in infant botulism cases prompted the U.S. Food and Drug Administration to trace contamination to organic whole-milk powder supplied to ByHeart, a maker of whole nutrition infant formula.
51 Cases Span 19 States
Health officials identified 51 infants with botulism linked to the formula as of January 23, 2026.[1][2]
The outbreak involved Clostridium botulinum Type A bacteria. Cases stretched across 19 states, with the most recent reported in December 2025. No fatalities occurred. Whole genome sequencing confirmed that bacteria from a formula sample matched cultures from an affected infant.[1]
Infant botulism arises when bacterial spores produce toxins in the gut, leading to muscle weakness and breathing difficulties in young babies. The FDA and Centers for Disease Control and Prevention first flagged concerns in November 2025 after reports of increased cases.[3]
FDA Testing Exposes Contamination Source
Laboratory analysis detected the bacteria in two key samples. One came from an unopened container of ByHeart Whole Nutrition Infant Formula. The second originated from organic whole-milk powder sourced from an unnamed third-party supplier.[1][2]
The agency issued an update stating these results advanced the probe, though investigators continued to pinpoint the exact contamination origin. For details, see the FDA outbreak investigation page.[2]
ByHeart products represented about 1% of the U.S. infant formula market. The company entered the sector in 2016 and gained traction during the 2022 supply shortages.
ByHeart Recalls All Products Nationwide
ByHeart initiated a voluntary recall of all its infant formula cans and single-serve packs in November 2025. The action followed FDA notifications of potential links to early cases.[2]
Co-founders Mia Funt and Ron Belldegrun expressed regret in a statement: “We take our responsibility to ByHeart families incredibly seriously and we are deeply sorry for the impact this outbreak has had on our community.”[1]
The firm emphasized full cooperation with regulators. Testing on incoming milk powder had met standards at the time, yet proved inadequate against this threat.
New Safeguards Strengthen Supply Chain
ByHeart announced rigorous updates to prevent recurrence. The company partnered with IEH Laboratories to implement testing for Clostridium botulinum at every supply chain stage, from farms to factories.[1]
Plans included third-party verification for each formula batch and a new food safety advisory board of independent experts. Additional controls targeted manufacturing processes overall.
- Mandatory Clostridium botulinum screening on raw ingredients.
- Batch-level testing of finished products.
- Supply chain audits and emerging risk monitoring.
- Full refunds for purchases from ByHeart.com since August 2025.
Key Takeaways:
- 51 confirmed cases, no deaths, investigation ongoing.
- Contamination traced to supplier’s organic whole-milk powder.
- ByHeart expands testing and forms expert safety board.
This outbreak underscores vulnerabilities in even tightly regulated infant nutrition supply chains. While ByHeart works to restore confidence, parents remain urged to heed FDA recall guidance. What steps should formula makers take next to protect the most vulnerable? Share your thoughts in the comments.
