How Many Times can You Reheat Formula?

Babies frequently only consume a small amount of the prepared formula. If you’ve prepared a bottle of formula and your baby has left a few ounces, you might be unsure whether to reheat it. We examine the recommendations for reheating formulas and suggestions for minimising formula waste. Reheating formula is not advised because it could be dangerous. It is better to make formula as needed, and it only needs to be heated once.

If you have read the manufacturer’s label on the formula packet or have asked friends for guidance, you are probably already aware of this information. If you’re unsure of the precise reason you cannot reheat the formula, we explain it here.


How Many Times can you Reheat Formula?

As you have read, it is not recommended to refrigerate the formula repeatedly. It might be fine to put the formula back in the refrigerator if you have very briefly removed it from the refrigerator and have not heated it.

It is not advised to put the formula back in the fridge if you are unsure how long it has been out of the fridge, if it is a warm day, or if you have kept the bottle in a warm location.

Any time spent removing the baby formula from the refrigerator can promote the growth of bacteria; the longer it is left out, the more germs will spread.

It is crucial to remember that the initial 24 windows must be followed for the milk to be heated safely if you remove the formula from the refrigerator for any length of time and then put it back inside. The refrigerator formula should be thrown out if you think it has been there for longer than 24 hours.

You should identify the containers when producing many bottles of formula that will be heated later, so you will know how long they will stay fresh.

How to Store Formula Safely?

You must follow CDC recommendations if you want to heat baby formula safely. It is advised to keep the prepared formula in the refrigerator for no more than 24 hours.

Bacteria growth is the main cause of the formula becoming bad. The formula will start to spoil after two hours if it is left at room temperature. After two hours, the formula will be unusable since warm temperatures allow bacteria to grow quickly.

Pre-prepared milk must be kept in the refrigerator and only taken out when you are ready to heat it. Since bacteria grow more quickly in warmer temperatures, they will still thrive at lower fridge temperatures.

In addition to developing in warm environments, bacteria also begin to grow when your infant starts to eat, and saliva enters the bottle. There is nothing to worry about in this situation because having some bacteria is normal and won’t harm your baby.

However, if you let the partially digested formula sit and grow more germs, this could become a problem if you use it again.

Can I Reuse the Heated Formula in the Refrigerator?

Unfortunately, the formula should not be returned to the refrigerator once cooked. You will need to discard the prepared formula if your infant doesn’t consume it entirely.

Because the heated formula is warm and damp, bacteria thrive there, which is bad for your kid. You might believe placing the formula back in the refrigerator will prevent further bacterial growth. However, even at refrigerator temperature, bacteria can still develop, so it is best to be safe.

If you store leftover or unused formula in the refrigerator, you probably do so to reheat it when your baby is hungry once more.

Reheating the formula will promote the growth of bacteria in a bottle that is already contaminated, increasing the likelihood that your baby will get sick.

What are the Four Ways to Reduce Formula Waste?

As we now know, there are very specific preparation, storage, and heating instructions for baby formula. We know it can be difficult to discard the formula because it is costly, and you would have worked long hours preparing it.

There are, however, ways to stop formula from going to waste. Here are simply four strategies to prevent formula waste:

When Travelling, Avoid Pre-Planning

If you’re planning a trip and want to be as prepared as possible, you can make extra bottles that you can’t heat or store and throw away.

Instead, you can mix a bit of formula and water as needed by taking them separately.

If you believe this will be too challenging, plan to keep the formula cool while travelling and schedule a stop where you can safely heat the formula.

Reduce Serving Sizes

Making too much formula is one of the major blunders people make.

You can prepare smaller portions of the formula if you see that your baby prefers different amounts, and if the initial batch is completely consumed, you can always prepare another.

You can create two smaller servings and reheat them one at a time if you know your baby won’t wait for the second batch to be cooked.

Use a Milk Dispenser

Suppose you do notice that your baby only wants a few ounces at a time. In that case, you can get a milk pitcher to store everything in one container and then pour it into bottles as needed, rather than keeping several bottles or containers in the refrigerator.

What are the Do’s and Don’t of Reheating Formula?

There are a few easy steps to ensure you safely reheat the formula if you decide to refrigerate it the following day. Make sure to work on a clean surface while preparing a bottle to be stored in the refrigerator to prevent contamination.

Before adding the formula mixture to the bottle, be sure it has been completely sterilised. The combination can be left out after preparation for no more than an hour at room temperature. After that, it needs to go in the refrigerator.

Make sure to utilise the prepared bottle within 24 hours after putting it in the refrigerator because doing so after that point is unsafe. Never freeze undisturbed formula; freezing might alter the nutrients in the mixture. Always keep it in the refrigerator. The formula should only be reheated once, and any remaining liquid should be thrown away.

We suggest using a bottle warmer to reheat the formula from the refrigerator properly is an easy substitute if you don’t have a bottle warmer! Warm a cup of water in the microwave until it is hot, then put the prepared bottle inside so that the water will warm it.

After a few minutes, remove the bottle from the heated mug of water and test the mixture on your wrist to see if it has achieved the right temperature. However, never put a bottle of formula straight into the microwave because it might quickly and unevenly overheat, endangering your baby while they are drinking.

Is it True that Babies Respond Better to the A2 Formula?

As a result, compared to A1 milk, this special A2 cow’s milk has a protein level that is more similar to breast milk. This could make it healthier for your baby. Because it is probably easier on their tummies, the A2 formula may be a great substitute for premature newborns with weak digestive systems.

Natural A2 protein is easier to digest and can support brain growth and development throughout these crucial toddler years. After two, children should drink low-fat or non-fat milk, such as a2 Milk 2 per cent reduced-fat, as it has the same nutritional value as whole milk but less saturated fat.

Reference: Innovative applications of freeze-drying to produce compound formula instant foods: A review

What are the Nutrients Content of the Formula?

Today, the majority of infant formula is manufactured from cow’s milk. They are supplemented to give infants all the nutrients they require to develop and be healthy and make them as similar to breast milk as possible.

The majority of cow’s milk formulas include:

  • Iron Protein Calcium Zinc Calcium and Zinc Vitamins A, C, D, E, and B Vitamins in the form of the milk sugar “lactose.”
  • To further resemble breast milk, some formulas include additional nutrients, such as:
  • Important fatty acids. The baby’s brain and vision depend on the fatty acids ARA and DHA.
  • When the mother consumes them, they naturally appear in breast milk. Many formulas incorporate them. However, there is little proof that giving children formulas with added fatty acids will benefit them as they develop.
  • Nucleotides. These RNA and DNA-building units also exist in breast milk and some formulas. They are believed to strengthen the infant’s immune system and aid in developing the digestive system.
  • Probiotics as well as prebiotics. Probiotics are “healthy” bacteria that may offer some defence against the infection-causing “bad” bacteria. Prebiotics encourage the development of these beneficial bacteria in the stomach.
  • Probiotics added to infant formula may shield infants from developing dermatitis, but it doesn’t appear to ease colic or diarrhoea.


The answer to the question, “How many times can you reheat formula?” depends on the preparation of the bottle and the temperature of the room in which it is stored. Reheating formula is safe if it is not partially consumed or spoiled. The refrigerated formula for more than 24 hours may contain bacteria and should be consumed within that time. Reheating breast milk or formula should be done as soon as possible after it has been made, but no longer than 48 hours later.

Many parents are tempted to reheat unused bottles of formula. Not only is the reheating of formula unhealthy, but it also exposes their child to harmful bacteria. In addition, bacteria can grow on the outside and inside of baby formula bottles, making them an ideal breeding ground for harmful bacteria. In addition, unopened bottles of the formula are also a tamper-proof breeding ground for various bacteria.