A prepared formula bottle is good for up to 2 hours at room temperature if untouched. Once a baby starts drinking from it, the formula should be used within 1 hour and any leftover discarded. Prepared formula can be stored in the refrigerator for up to 24 hours if not started yet. Opened powder formula should be used within 30 days, and opened liquid concentrate or ready-to-feed formulas within 48 hours if refrigerated. Unopened formula should be used by the "use by" date on the package. Detailed storage times:
- Prepared formula at room temperature: up to 2 hours
- After feeding starts: use within 1 hour
- Refrigerated prepared formula: up to 24 hours
- Opened powder formula: use within 30 days (store dry, not refrigerated)
- Opened liquid concentrate / ready-to-feed: use within 48 hours refrigerated
- Unopened formula: use by printed date
Always discard any formula left in the bottle after the feeding due to saliva contamination and bacterial growth risk. Never freeze formula as it can damage quality. These guidelines help keep formula safe and fresh for feeding infants.
