Key points
- No new cases have been added to the investigation since the December 10, 2025 update.
- Infant botulism happens when a baby swallows Clostridium botulinum spores that grow in the gut and make toxin.
- Infant botulism often starts with constipation but is usually first noticed as difficulty feeding (sucking and swallowing), a weak and altered cry, and lack of head control.
