Baby Poop Smells Like Vinegar Teething

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Baby Poop Smells Like Vinegar Teething

It’s possible for baby poop smells like vinegar teething, but the direct cause is not tooth eruption. Teething is a difficult and unpleasant process for a baby, and often painful. When babies start to erupt their teeth, the baby becomes nervous because of the feeling of itching and pain that occurs when the tooth cuts the gums. 

The baby is upset and every object that is within its reach is taken into the mouth. The baby bites those objects trying to ease that discomfort. Items around the baby can be dirty, full of dust and it can even end up with your dog’s toy in its mouth. These items can have various bacteria, parasites, and other impurities on them.

When these impurities reach your baby’s stomach, it smells like vinegar. The stool is soft and has a bad smell. This is the first indication that something is wrong with the baby’s digestive tract.

Parents should not panic because this happens quite often. You have to make sure that the things around your baby are clean and that nothing in its environment can endanger the little one’s health.

There is a possibility that the baby does not absorb food well, i.e. the digestive tract does not tolerate milk (lactose intolerance) or some other food. In all these cases, the baby’s poop smells of vinegar, it is soft, and that causes diarrhea and gas. Try with some baby probiotics, and if that doesn’t work, take it to a pediatrician.

When your baby’s teeth grow, excess saliva can cause your baby’s stools to increase. Saliva is like a laxative and can irritate the stomach so your baby will have more frequent stools. 

There is no expert advice and medical opinions regarding baby poops smelling like vinegar when baby teething. This phenomenon has been noticed by parents, therefore you can always seek the advice of a pediatrician in such cases to preserve the health of your baby.

Why do babies have loose stools when they are teething?

Your baby may have loose stools and that is a normal reaction of the baby’s body at the time of teething. The reason is that the baby drools a lot. Saliva is caused by irritation of the gums while teeth are erupting. Saliva irritates the stomach and your baby ends up with loose stools. 

Saliva is like a laxative and that is why your baby has more frequent, intensified, bad-smelling stools, and if it lasts longer it can lead to diarrhea. It is nothing dangerous, there are many supplements to soothe inflamed gums, but if the baby still has problems with loose stools, consult a pediatrician. Do not wait long for diarrhea to take hold.

When the baby is teething, it can be nervous and feel irritation of the gums. Therefore babies tend to put a lot of things in their mouths to soothe the pain.

Items that the baby puts in the mouth can be dirty and carry various bacteria, and those impurities can cause diarrhea and vomiting, which may impair your baby’s appetite. 

So, parents should make sure that toys and other items around your baby are clean. This also happens when babies do not erupt their teeth, they simply explore the world around them by putting various objects in their mouths.

All problems of this type, if they are long-lasting, require medical supervision. Don’t wait for it to get complicated.

When do babies stop having mucus in their stool?

Baby Poop Smells Like Vinegar Teething

The mucus in the baby’s poop will probably stop when you introduce solid foods into your baby’s diet. Babies do not have the same stool as adults.

In the first months of life, they feed only on milk so their poop is somewhat rarer and may contain mucus. The baby’s digestive tract can secrete mucus to make food pass through the intestines more easily, which is quite normal.

Mothers who breastfeed their babies must pay attention to their diet because everything they eat goes into the milk their babies drink. That’s why strong, hot, and spicy foods can irritate a baby’s stomach and create mucus.

Babies that are bottle-fed can irritate their stomach with milk that does not suit them. The solution is to find the right kind of milk that does not cause irritation.

Allergic, bacterial, or viral infections can cause mucus in your baby’s stool. In addition to mucus, it is accompanied by blood in the stool, temperature, vomiting, and appetite loss. Such medical problems can be serious. Be sure to consult a pediatrician, and don’t wait for the condition to get worse.

Why does my Baby have green poop all the time?

Baby Poop Smells Like Vinegar Teething

The answer is not so simple. A mother who breastfeeds her baby eats a lot of green food, spinach, salad, chard, and so on. Everything that a mom eats can affect the baby’s stomach and its poop, and even strong spicy food can cause green and mucus stools. 

If the mother is taking certain medications, especially antibiotics, she can pass those substances through the milk onto the baby. Then the baby’s poop can turn to green. 

When a baby starts taking other foods with milk, it can upset the baby’s stomach. They are usually baby porridge, and later solid food. Any of these changes can lead to green poop if the baby has a sensitive digestive system.

Green poop also occurs when the mother does not have enough milk, the milk is not of good quality or not fat enough. Green poop can also be the result of dirty hands in its mouth and some bacteria or other impurities entering the baby’s digestive tract. 

Stomach flu or a viral or bacterial infection can be very difficult for a baby. Symptoms include fever, green and mucus pop, and even blood in the stool.  An allergy to a food, more precisely an allergy to a food ingredient, can be also manifested by redness of the skin. When parents recognize these symptoms, a visit to the doctor is necessary.


Parents should be aware that the baby’s body functions differently compared to an adult’s body. Newborns are very sensitive, their skin, their head, as well as their digestive system. They need some period to get adapted to mother’s milk and later on to some other food. 

When baby poop smells like vinegar teething, one should know that this happens a lot. And it probably does not have any relation with teething itself.

Maybe the baby ate something that’s not soothing its stomach, the milk formula is too strong for the baby, or your little one has simply put something in its mouth that is full of bacteria and dust. 

All this can result in one very popular condition among infants and that baby poop smells like vinegar teething. 

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My name is Catherine. I'm a Mom and one of the avid writers working on HerScoop!