Baby Spitting Up Mucus: Causes, Prevention & When to Worry

Baby Throwing Up Mucus – Causes and Preventive Tips

There are many different reasons why newborn babies may vomit. While it’s upsetting for parents and babies, there is typically a simple cause. Many newborns will vomit mucus in the early hours and days following delivery. This primarily consists of excess amniotic fluid from the womb that has been combined with mucus from the baby’s stomach lining to absorb milk feeds.

Seeing a baby coughing and vomiting mucus or milk (which obtains a mucus-like texture) can disturb parents. Spitting up is quite normal, but when mucus or projectile vomit seems to be a recurring incident, it may cause alarm. Mucus spit-up in babies is natural, but if it happens frequently (more than a few times a day), you should be concerned. Seek medical help if you notice any blood traces in the mucus or if your infant displays any distress. The reasons behind it can vary, and it is important to figure out why it’s happening to your child.

Is it Normal for a Baby to Throw Up Mucus?

A baby throwing up milk or mucus is not an uncommon thing at all. Many parents have seen their children vomit mucus or milk in their infancy. While this is quite normal, a repeated occurrence may cause worry. The presence of blood or any gestures by your baby indicating pain or trouble warrants immediate attention.

Also Read: Mucus in Baby’s Poop

When Does it Occur?

This phenomenon usually occurs in babies due to an immature digestive system. One of the most important parts of the entire tract is the area ranging from the throat to the stomach. This section requires a good amount of time to develop fully and be ready to retain the food within the body. All the spit and the milk that a baby feeds on can easily find its way back up to the mouth, causing the vomit to be yellow.

Most children stop throwing up spit or milk once they sit up straight. While many babies do so after completing around 7-8 months, some children may continue to do so even up to a year after their birth.

What Are the Common Causes Behind an Infant Vomiting Mucus?

When a baby throws up milk or vomiting mucus, there may not be just one reason that has made it happen. There could be a variety of causes for the same, ranging from illness to overfeeding.

1. The baby may have an infection or illness

Since a baby’s immune system is still developing in the early months following birth, he makes for an easy target for various bacteria and viruses, leading to an infection or illness. Usually, these can affect the respiratory system, causing him to cough extensively, leading to intermittent vomiting. Similarly, certain bacteria can affect the digestive tract or the intestines, leading to indigestion and diarrhoea, accompanied by vomiting.

2. The baby may be suffering from pyloric stenosis

If a baby tends to vomit forcefully, emerging out in a projectile form, then there is a strong chance of the baby suffering from pyloric stenosis. It is quite a rare condition in most children; it usually manifests in the weeks following childbirth. A muscle connecting the intestine to the stomach tends to swell up and become thick, preventing food from passing further. This condition is rare, with fewer than 1 million cases reported annually in India.

3. He may have other obstructions in his intestinal path

While pyloric stenosis occurs due to a muscular anomaly, there might also be other obstructions in the pathway. Sometimes, a section of the bowel might slide towards the other section and form an obstacle. Some cases have also been observed where the intestines have twisted up, causing food to remain stuck wherever it is. Such conditions can cause a baby to vomit forcefully.

4. He may have ingested a poisonous substance

On a biological level, the act of vomiting is where the body rids itself of an undesirable element within the stomach or the digestive system. While undigested food also falls in this category, vomiting may just as well be the result of the baby having swallowed something inherently toxic or unhealthy. If the ingestion of something poisonous has taken place, certain medicines can even cause vomiting rather than treat it directly.

Causes of Baby Vomiting

5. The baby may be susceptible to motion sickness

Motion sickness is quite a common problem that plagues babies and adults. It is usually triggered when the brain observes a disconnect between the visual and the aural signals it receives. If the eyes and the body don’t seem to experience motion the same way, motion sickness might come into play, causing vomiting.

6. He might have been crying excessively for a long duration

Crying is the only form of communication babies are aware of, so they may burst into tears to convey hunger, fear, pain, or even plain irritation. However, suppose a baby continues to cry intensely for an extended period. In that case, it can cause the gag reflex in the throat to be stimulated and lead to the baby coughing heavily or even throwing up.

7. He may have an infection in his throat or stomach

The presence of viruses or bacteria that infect the stomach or the throat has a higher chance of vomiting. Throat infection usually causes cold and cough, both of which can trigger the gag reflex and lead to vomiting. Any digestive tract infection can cause the body to repeatedly throw up food due to the weak capacity of the stomach and intestines.

8. He may be vomiting due to an allergic reaction

Vomiting is usually a biological reaction to remove any toxic substance from the body; the same is true for an allergic reaction. An allergy is nothing but the response of the body’s immune system to an allergen, which could range from anything such as nuts to milk to fish and so on. Such conditions usually occur if you have recently introduced your baby to a new food type.

Infant Vomiting Mucus

9. Quick milk flow can also cause a baby to vomit

Certain women tend to have nipples larger than usual or use bottles with holes more significant than what’s usually available in the market. These can result in a fast milk flow and copious amounts, causing the baby to drink the milk speedily. Since the baby’s tummy is still in its development phase, it won’t be prepared for the intake of this quantity and may react naturally by throwing up.

10. The baby may be gassy

This is rarely because of indigestion and has more to do with the baby swallowing too much air while feeding. Parents tend to use a pacifier more often than not or allow babies to suckle on an empty feeding bottle. This causes their tummies to be filled with air, which can cause reflux and lead to the milk being thrown up.

11. He may be overfed

The digestive system of a baby takes quite a while to mature fully. A significant aspect that needs to be developed is the valve that plays a key role in keeping the food within the stomach. Feeding a lot of milk can put undue pressure on that valve, which can fail and cause the milk to rise, leading to vomiting.

Baby Vomiting

How You Can Help Prevent Your Baby From Vomiting?

Thankfully, even if your baby vomits yellow mucus or milk, there are a bunch of ways you can employ to prevent it from happening often. There is a good chance it may not indicate anything serious.

1. Repeated burping helps

While it is common to burp a baby after a feeding session has been completed, you can employ a different method for a child that vomits frequently. Make sure you encourage him to burp after he drinks 1/4th or even 1/8th the amount of milk he usually drinks to reduce the risk of him throwing up after the whole feed.

Burp a Baby

2. Reduce the flow of milk

If your baby is bottle-fed, make sure that the nipple on the bottle has a small hole and nothing too big to release a large amount of milk. This can help control the milk flow and allow the baby to drink at his pace. While breastfeeding, squeeze some milk out of your breasts first to avoid a large flow and let your child feed.

3. Switch to a different kind of milk

If your baby has been throwing up after drinking cow’s milk, he might be lactose intolerant. Therefore, it is best to switch to soy milk and see if there is any change in his condition. In rare cases, a unique formula of milk might be required for kids who are allergic to natural milk of any sort.

Milk for baby

4. Feed less milk but frequently

Your baby might have trouble keeping down the amount of milk he drinks due to a weak stomach valve. Therefore, you can try giving him a limited amount of milk while feeding him while simultaneously increasing the frequency of feeding sessions. This can keep his nutrition on track and allow him to digest the milk effectively.

5. Change your diet

The presence of allergic substances in your diet could also affect the child since they find their way into your milk. If you’ve made any dietary inclusions or changes recently, try removing them to see if it helps stop your baby from vomiting. Adjust your diet until you figure out the culprit and plan accordingly.

Baby Vomiting Preventive Tips

6. Allow feeding sessions to happen at a relaxed pace

Make sure that you don’t feed your child in a hurry. Go to a quiet place and let him provide slowly and calmly at his own pace. Let him relax after he’s done feeding and burp him gradually. Even after burping, allow him to lie in an inclined manner for half an hour.

Is It Possible for Your Baby to Choke on Vomit While He’s Asleep?

It’s only natural for you to worry whether having your baby sleep while he’s prone to vomiting could lead to choking on his vomit. Experts think this scenario is highly unlikely as long as your baby is sleeping on his back (as recommended). Similarly, if your little one does not have a particular condition that makes it difficult to clear his airway, such as a cleft palate, he is unlikely to choke on his vomit.

When to Worry?

As mentioned earlier, vomiting usually occurs due to improper feeding or foreign elements. These issues can be corrected quickly, and the chances of vomiting can be reduced extensively. However, certain signs you notice can be a cause for worry since they indicate the presence of a complication.

  • While most vomited mucus has the same consistency as milk, there might be a situation when the mucus is quite thick. This can then be inhaled accidentally and cause the baby to choke on it, leading to breathing difficulty and further complications. If it finds its way into the lungs, it can be fatal and might need to be removed by an aspirator. Saline drops can be used to thin the mucus.
  • At times, you may notice that the baby’s vomit might contain traces of blood or may even have blood in substantial quantities. This blood could stem from an injury in his mouth, which caused him to swallow the blood earlier. In a few cases, forceful vomiting or repetitive vomiting could lead to the inflammation of the oesophagus tissue, causing it to bleed internally. However, if the blood is dark brown, your doctor may ask for a sample and send it for examination. If it is found to contain bile, then it could indicate the presence of an obstruction in the intestine, which will need proper medical attention.
  • Most babies tend to vomit out milk and seem to calm down or act indifferent about it. However, if your baby cries uncontrollably and seems to be in pain after he has vomited, you need to take him to the doctor immediately. Severe pain following a vomiting session could indicate the presence of blocked bowels or an intestinal situation that requires immediate and urgent medical attention.
  • In some cases, you might find that your infant’s abdomen tends to look swollen on the outside. Touching the abdomen might even make you aware of its tenderness. This is quite similar to the existence of gas in the stomach or even other substances. It could also indicate a blockage in the intestines or other issues in the digestive tract. In any case, it would be best if the doctor examined this.
  • If your baby was not vomiting earlier (at least, not frequently) but has started doing so after falling down or an injury that seemed minor, this could be a cause for concern, for sure. Your infant may have suffered a concussion (little or significant), and the body might be reacting to it by vomiting. Take your child to the hospital if the vomiting is uncontrollable and repetitive since falling.


1. How Long Does Mucus Last in Newborns?

Due to the excess amniotic fluid in their noses, newborns frequently have congestion shortly after birth. You can catch them sneezing more regularly as they attempt to relieve the congestion. Fortunately, this congestion should go away a few days to a week.

2. Why Is My Baby Spitting up Green Mucus?

Green mucus is a sign that the white blood cells are battling the pathogen infecting the body. The green mucous typically clears up within a few days. According to the paediatrician’s recommendation, your infant may need antibiotic treatment if they have been coughing up green mucus for more than a few days.

3. Why Is My Baby Spitting up Yellow Mucus?

A cold is the most frequent cause of a baby’s yellow mucus vomit. Your baby could also be sick with a gastrointestinal virus. After emptying her stomach, she can throw up mucus in this situation. 

4. How Can I Get Rid of My Infant’s Mucus Naturally?

Caregivers can aid a congested newborn by using a rubber suction bulb to remove mucus. The baby’s pain can also be reduced by applying nasal saline drops and using a humidifier, among other home remedies. The baby will spit up thick white mucus naturally.

5. How Do I Keep My Infant Hydrated After Vomiting?

Till the vomiting ceases, give 15 mL (1 tbsp) water every 10 to 15 minutes. Once your youngster can consume the normal amounts, progressively increase the amounts. Take your child to the hospital if the vomiting lasts more than 4 to 6 hours.

Knowing why your newborn is vomiting mucus is just as important as knowing how to solve it. Since the condition is quite normal, it is best to stay calm and figure out why while never hesitating to contact the doctor when required.

Infographic: Tips to Prevent Your Baby from Vomiting Mucus

Tips to Prevent Your Baby from Vomiting Mucus - Infographic

Also Read:

Spitting Up in Babies
Baby Spit Up Through Nose

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