Deep Dive: Shared Milk Supplier Links Closed ByHeart and Nara Organics Infant Botulism Outbreaks

**Deep Dive — Shared Milk Supplier Links Two Closed Infant Botulism Outbreaks**

**Background**

Infant botulism is rare. In late 2025 ByHeart formula was linked to ~48 cases. In 2026 Nara Organics was linked to 4 cases. Both outbreaks are now closed.

**What changed**

WGS matched samples across the two outbreaks. Both used milk from Organic West Milk spray-dried by Dairy Farmers of America. Root-cause investigation ongoing.

**Competing viewpoints**

Agencies see common-source evidence. Manufacturers cooperated with recalls. Some parents want faster supplier transparency; others note low absolute risk.

**What to watch next**

FDA root-cause findings, any further brand links, BabyBIG supply. Do not use remaining ByHeart or Nara formula. Seek care for symptoms of botulism without waiting for labs.

Sources: CDC, FDA, Contemporary Pediatrics. Not medical advice.