According to the USDA:
Storing Infant Formula
Store bottles of prepared infant formula in a properly functioning
refrigerator until ready to use. Bacterial growth is reduced when
infant formula is kept in a refrigerator at temperatures at 40 degrees
Fahrenheit or below. (Use a special thermometer to test if the
refrigerator is at the appropriate temperature.) Caregivers should
always consult their health care provider and follow the
manufacturer’s label instructions for infant formula storage
procedures. In general, it is recommended that caregivers:
- Use refrigerated bottles of concentrated or ready-to-feed infant formula within 48 hours of preparation.
- Use refrigerated bottles of powdered infant formula within 24 hours of preparation.
- Open cans of concentrated or ready made infant formula should be covered, refrigerated, and used within 48 hours.
- Freezing infant formula is not recommended.
- Powdered infant formula should be tightly covered and stored in a cool, dry place and used within a month after opening.
- Discard any infant formula remaining after a feeding. The mixture of infant formula with saliva provides an ideal breeding ground for
- Infant formula that is removed from refrigeration should be used within 1 hour or discarded.
- Before reusing any bottles or their parts, they should be cleaned and sanitized.
The full 20-page document describes all aspects of formula feeding - different types of formula, what's in formula, information about milk, bottle feeding tips