Can powdered infant formula contain harmful bacteria?
Yes. Powdered infant formula is not sterile and can harbor dangerous bacteria including Cronobacter and Clostridium botulinum. A 2026 multistate outbreak confirmed this risk.
What's actually in it
Powdered infant formula is manufactured through a spray-drying process, which reduces but does not eliminate bacterial contamination. Unlike ready-to-feed liquid formula, powdered formula is not sterile.
The bacteria of most concern are Cronobacter sakazakii (formerly Enterobacter sakazakii) and Clostridium botulinum. Both can cause severe, life-threatening illness in infants. Cronobacter causes meningitis and sepsis. Botulinum toxin causes infant botulism.
What the research says
A 2026 report in NEJM Evid described a multistate infant botulism outbreak directly linked to powdered infant formula. The cases involved infants who consumed formula contaminated with C. botulinum.
This is why the FDA and WHO recommend mixing powdered formula with water that's at least 70°C (158°F) to kill any bacteria before letting it cool. Using water that's too cool defeats this protection.
For newborns and premature infants, ready-to-feed sterile liquid formula is the safest option. If you use powdered formula, follow the preparation guidelines exactly: hot water, proper mixing, and refrigerate any unused portion promptly.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Multistate Infant Botulism Outbreak Associated with Powdered Infant Formula | NEJM Evid | 2026 |
What to use instead
Browse our vetted, non-toxic alternatives. Every product is third-party certified.
Shop Non-Toxic Baby