Symptoms Of Baby Drinking Spoiled Formula
Baby Toddler Safety

Symptoms Of Baby Drinking Spoiled Formula

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Are you unsure if the formula in your baby’s bottle is still fresh?

In this post, we’ll go over some of the symptoms of baby drinking spoiled formula and measures to protect your baby from drinking spoilt or old formula.

Every parent, especially new parents, is concerned about their children drinking bad formula. 

Parenting is a challenging job, and we all make mistakes. Giving a spoilt formula to a youngster is one such blunder.

Then, especially for first-time mothers, panic and anxiety set in. It’s frustrating to know the consequences of drinking the bad formula.

However, you need not be concerned because this situation is not as difficult as it appears.

Keep reading to know more about symptoms of baby drinking spoiled formula.

Symptoms Of Baby Drinking Spoiled Formula

Do you want to know what happens if your infant consumes spoilt formula milk?

You wake up late at night to prepare a formula feed for your baby, still half-asleep, and you feel something is wrong.

Abdominal pain, vomiting, and diarrhea can occur if an excessive amount of spoilt milk is ingested (diarrhea caused by food).

When consuming spoilt milk, symptoms usually improve within 12 to 24 hours. 

A bottle of formula that is left over after being prepared and swallowed by your infant should be thrown away right away.

Germs from your baby’s lips have infected that bottle. Bacteria that may have developed there are present.

Spoiled milk can result in stomach pains, vomiting, and diarrhea (like a food-borne outbreak).

The consequences of spoilt milk are usually not felt for 12 to 24 hours after consuming it. Do not be alarmed if you or your child consumes spoilt milk.

1. What Does “Old Formula” Mean?

Any formula milk for a newborn after 2 hours of preparation is deemed old or spoilt. This theory is based on two factors.

To begin with, if a formula is left open for an extended period, it will spoil due formation of bacteria known as Enterobacter sakazakii.

This naturally occurring bacteria is found in dry foods like herbs, powdered milk, and infant formula.

Several research studies on baby health claim these germs are extremely harmful and fatal for newborns with pre-existing medical issues and an underdeveloped immune system.

2. How Can You Tell If Your Formula Is Bad?

It’s wise to err on caution if you’re unsure about your baby’s formula expiration.

If food appears to be old or ruined, do not feed it to your infant and dispose of it immediately.

When providing your baby formula, you must adopt good hygiene to avoid foodborne infections.

Before preparing your baby’s milk, remember to wash and dry your hands. Keep an eye out for indicators of spoiled milk.

When the formula starts to fail, you should observe the following:

3. What Happens If Your Baby Consumes Spoiled Formula Milk?

If you follow correct breast milk handling and storage recommendations, formula milk will rarely deteriorate.

Although this can happen on rare occasions, the most common symptoms are vomiting and diarrhea.


The first sign that your infant has consumed tainted formula milk is vomiting and diarrhea.

Vomiting is a way for your baby’s digestive system to get rid of spoiled food. After vomiting, some newborns may develop a fever, while others may quiet down and recover.


If your infant ingested tainted formula milk, her body would attempt to cleanse itself through diarrhea.

The damaged food passes through the baby’s system differently from vomiting.

Both of these processes cause your baby to become weak and dehydrated, and they can disrupt her feeding schedule.

You should track how often your baby vomits and either give him some water to rehydrate or take him to the doctor right away.

4. How Long Will a Baby, Get Sick After Drinking Spoiled Milk?

After ingesting contaminated food with damaging chemicals, babies frequently develop nausea on the first to a second day.

Bacterial toxins detected in sour milk are mainly the result of leaving it at room temperature or allowing it to sit in direct sunlight.

If you mistakenly feed rotten formula to your infant, they will most likely have vomiting, diarrhea, and a fever.

All of these symptoms will most likely last one to two days.

The best approach to keep your child healthy and happy is to take the proper precautions regardless of whether you use formula or breast milk.

Among the measures that could be beneficial are:

  • Sanitize everything in preparation and storage.
  • Since bacteria arises naturally and settles on surfaces, there isn’t much you can do about it. On the other hand, maintaining good hygiene can assist in keeping your baby’s food from being contaminated.
  • Clean any feeding equipment you use to produce and store your baby’s meals. If you’re pumping breast milk, make sure to sterilize all pump parts throughout each use.
  • Utilize the Liquid Formula before the expiration date.

Enterobacter sakazakii, a naturally occurring bacteria that settles in dry foods, appears to stick to powdered items more than liquids.

Consuming liquid formula milk lowers your baby’s risk of contracting germs.

On the other hand, the liquid formula must be tightly sealed and stored per the manufacturer’s instructions.

Do not warm the milk in the microwave. It is not necessary to warm your baby’s formula before feeding.

On the other hand, microwaving the milk formula or bottle is not the greatest option.

This approach does not evenly warm the food, resulting in temperature variations causing weird patches throughout the meal that stimulates bacterial growth.

Ensure the formula milk lid is securely closed while not in use and cover the lid promptly after scooping what you need to make a meal.

Additionally, the water used to make the formula must be clean or have been boiled and chilled before usage.

Always feed your infant within two hours of making the formula milk and discard any leftovers immediately.

Wash your hands with mild soap and water after using the restroom or changing your baby’s diapers.

Learn more from a different post: What To Do With Expired Baby Formula


Now you know about the symptoms of a baby drinking spoiled formula.

As fulfilling and lovely as feeding your baby may appear, you must know proper formula milk storage recommendations and the differences in milk appearance, smell, and taste of fresh formula milk.

This can assist prevent you from throwing out good milk unnecessarily.

Since a baby’s immune system is still developing, it’s critical to take the proper precautions when preparing their formula, as some diseases might be fatal.

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Frequently Asked Questions 

What Happens If You Give Your Infant Formula That Is Past Its Expiration Date?

That has nothing to do with food safety, but the nutrients in the formula will begin to decay after the use-by date.

Abdominal pain, vomiting, and diarrhea can occur if excessive spoilt milk is consumed (diarrhea caused by food).

When drinking spoiled milk, symptoms usually improve within 12 to 24 hours. 

What Happens If a Baby Consumes a Three-Hour-Old Formula?

It causes severe diarrhea or vomiting in infants and is potentially fatal.

After a meal, there is a lot of crying or fussiness, tight abdomen, and Stools that are very loose and watery.

Prepared infant formula might degrade if left out at room temperature.

Hence you should use it within two hours post preparation and one hour before feeding.

If you don’t use the prepared infant formula within 2 hours, but the bottle in the refrigerator and use it within 24 hours.

When It Comes to Formula Milk, How Long May It Be Left Out?

It’s also a good idea to keep open cans of formula in the refrigerator for up to 24 hours.

They should be cleaned in a day after being covered, and dried fruits should be stored in them within 24 hours.

While prepared formula should not be left at room temperature for more than 1 hour, if it has not been consumed, it should be thrown.



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Iesha Mulla

Iesha is a loving mother of 2 beautiful children. She's an active parent who enjoys indoor and outdoor adventures with her family. Her mission is to share practical and realistic parenting advice to help the parenting community becoming stronger.

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