Are powdered infant formulas sterile?

• A. Yes
• B. No
• C. Sometimes
• D. Only if refrigerated

Answer: (B)

Powdered infant formula is not sterile. The drying process used to make powder from liquid milk does not achieve sterilization, and contamination can occur during manufacturing, packaging, or handling. Because of this, bacteria such as Cronobacter sakazakii can be present in powder formulas, which is why they are treated as not sterile and require careful preparation and handling. Refrigeration does not sterilize; it only slows growth, so keeping powder or prepared formula cold does not make it free of microbes. The correct takeaway is that powdered infant formula is not sterile. For safety, follow proper preparation practices, use clean equipment, and feed prepared formula promptly, discarding any leftovers.