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Storing ready-to-feed formula once opened Storage of opened ready-to-feed formula will depend on which formula you are using. 32-fl-oz bottles: Immediately store the open 32-fl-oz bottle in the refrigerator. Use the remainder of the formula within 72 hours of opening.

Prepared room temperature formula can stay out for two hours, but if you've started to serve it to your baby, it has to be used within one hour. Bottles not given to your infant should be stored ASAP in the fridge and are good for 24 hours.

Does FDA approve infant formulas before they can be marketed? No, FDA does not approve infant formulas before they can be marketed. However, all formulas marketed in the United States must meet federal nutrient requirements and infant formula manufacturers must notify the FDA prior to marketing a new formula.

This is also an opportunity for the practitioner to address any misperceptions that the parents may have. “For example, many working parents believe the infant should trial formula as early as possible, just in case formula is needed during separations, but that is not the case,” says Dr. Schreck.

If you prepare formula ahead of time, store it in the refrigerator. You can use pre-made formula for up to 24 hours. Open containers of ready-made formula, concentrated formula, and formula prepared from concentrate can be stored safely in the refrigerator for up to 48 hours.

Once opened, powdered formula typically needs to be used within one month. However, the instructions vary from manufacturer to manufacturer, so make sure to check the container.

The US Food and Drug Administration (FDA) regulates commercial infant formulas to make sure they meet minimum nutritional and safety requirements. Iron-fortified infant formulas are recommended, and most commercial infant formulas sold in the United States contain iron.

Prepared infant formula can spoil if it is left out at room temperature. Use prepared infant formula within 2 hours of preparation and within one hour from when feeding begins. If you do not start to use the prepared infant formula within 2 hours, immediately store the bottle in the fridge and use it within 24 hours.