
It can be distressing for parents to see their baby spitting up during sleep, but it is a common occurrence in infants and is usually not a cause for concern. Spit-up happens when the contents of the baby's stomach, typically milk or formula, flow back up into the oesophagus and sometimes out of the mouth. This occurs because the valve between the stomach and the oesophagus, known as the lower oesophageal sphincter, is still developing in infants. As a result, the contents of the stomach can easily come back up, especially after feeding. To reduce the likelihood of spit-up during sleep, it is recommended to adjust the baby's sleeping position, ensure proper burping techniques, and adjust feeding techniques.
| Characteristics | Values |
|---|---|
| Frequency | Spitting up while sleeping is a common occurrence in newborns, especially during the first few months |
| Cause | The immaturity of a baby's digestive system, including a small stomach and immature esophageal sphincters, can cause milk to come back up |
| Risk | Spitting up is generally harmless, and babies have a natural reflex to prevent choking on spit-up by turning their head to the side or swallowing it back down |
| Prevention | To reduce the likelihood of spit-up, proper burping during and after feeding, smaller and more frequent feedings, and ensuring the baby is positioned properly during feeding can help |
| Sleeping Position | Placing the baby on their back to sleep is recommended to reduce the risk of Sudden Infant Death Syndrome (SIDS) |
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What You'll Learn

It's usually harmless
It's understandable that new parents may feel anxious or alarmed when their baby spits up while sleeping. However, it's important to know that this is usually harmless and a normal part of infancy and infant development. The baby's safety is, of course, paramount, and understanding why this happens and knowing the difference between harmless spit-up and more concerning symptoms can help manage any anxieties.
Spit-up occurs when the contents of the baby's stomach, typically milk or formula, flow back up into the oesophagus and sometimes out of the mouth. This happens because the valve between the stomach and the oesophagus, known as the lower oesophageal sphincter, is still developing in infants, so the contents of the stomach can easily come back up. This is why spitting up is common during the first few months and usually isn't a cause for concern unless it becomes forceful vomiting or is accompanied by other symptoms like poor weight gain.
Babies have a natural reflex that prevents them from choking on spit-up. They will often turn their head to the side or swallow it back down. It's still essential to ensure your baby sleeps on their back, as this is the safest position to reduce the risk of Sudden Infant Death Syndrome (SIDS) and ensure they can clear spit-up easily. You can elevate the head of the crib slightly with a firm wedge or pillow under the mattress (never directly under the baby) to help keep their head higher than their stomach.
There are also some feeding techniques that can help reduce spit-up. Ensure your baby is positioned properly during feeding, with their head slightly elevated. Avoid overfeeding and allow your baby to feed at their own pace. You can also try offering smaller, more frequent feedings. It's also a good idea to pause and burp them before continuing with the feeding to help reduce the chances of more spit-up. Burping your baby gently during and after feeding sessions can help to reduce the amount of air swallowed, which can contribute to spit-up.
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Safe sleeping positions
While it can be alarming for new parents to see their newborn spit up while sleeping, it is a common occurrence in infants and usually not a cause for major concern. Spit-up is a normal part of infant development and happens when babies have difficulty digesting milk or formula. The contents of the baby's stomach flow back into the oesophagus and sometimes out of the mouth due to the immaturity of the lower oesophageal sphincter.
To reduce the likelihood of spit-up during sleep, it is recommended to adjust the baby's sleeping position. Here are some safe sleeping positions for newborns:
- Always place your baby on their back to sleep, as this is the safest position to reduce the risk of Sudden Infant Death Syndrome (SIDS). Sleeping on their front or side increases the risk of SIDS.
- Ensure your baby sleeps on a flat, firm, and waterproof mattress, free of soft bedding, extra padding, bumper pads, stuffed toys, or pillows.
- You can elevate the head of the crib slightly with a firm wedge or pillow under the mattress, but never place it directly under the baby. This helps keep their head higher than their stomach.
- Avoid using baby swings, bouncers, strollers, car seats, and high chairs for sleep. Sleeping in an upright, semi-upright, or seated position can cause the baby's head to fall forward, making it hard for them to breathe.
- For the first six months, it is recommended that your baby sleeps in the same room as you, providing a smoke-free and well-ventilated environment.
- Once your baby can move themselves from their back to their front and back again, they will be able to find their own sleeping position.
- Proper burping techniques during and after feeding can help reduce the amount of air swallowed, which contributes to spit-up.
- Adjust feeding techniques by ensuring your baby is positioned properly during feeding, with their head slightly elevated. Avoid overfeeding and allow your baby to feed at their own pace.
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Why it happens
It is relatively normal for newborns to spit up or throw up while sleeping, and it is usually not a cause for major concern. This happens because a newborn's digestive system is still developing, and their small stomach and immature oesophageal sphincters can cause milk to come back up, especially after feeding. Spit-up occurs when the contents of the baby's stomach, typically milk or formula, flow back up into the oesophagus and sometimes out of the mouth. This happens because the valve between the stomach and the oesophagus, known as the lower oesophageal sphincter, is still developing in infants, making it easier for the contents of the stomach to flow back up. Spit-up is a common occurrence in infants and typically happens when babies have difficulty digesting milk or formula. It can also be caused by overfeeding, swallowing air during feeding, or having a sensitive stomach.
To reduce the likelihood of spit-up during sleep, you can adjust your baby's sleeping position by placing them on their back, which is recommended to reduce the risk of Sudden Infant Death Syndrome (SIDS). However, it is important to avoid elevating the head of the crib directly under the baby, as this can cause them to slide down into a position that may compromise breathing. Instead, you can use a firm wedge or pillow under the mattress to keep their head higher than their stomach. Proper burping techniques during and after feeding can also help reduce the amount of air swallowed, contributing to spit-up. Holding the baby upright after feedings and limiting their activity can also help reduce spit-up.
It is important to note that spit-up is generally not a cause for concern unless it becomes forceful vomiting or is accompanied by other symptoms like poor weight gain, which may indicate gastroesophageal reflux disease (GERD). GERD requires a medical diagnosis and is very rare in babies under one year old. If you are concerned about your baby's spit-up, it is always best to consult with your paediatrician or a healthcare professional.
In summary, newborn spit-up while sleeping is typically caused by the immaturity of the baby's digestive system, specifically the developing lower oesophageal sphincter, which allows milk or formula to flow back up. By understanding the causes and taking appropriate steps, such as adjusting sleeping and feeding positions and proper burping techniques, you can help minimise spit-up and ensure your baby sleeps comfortably and safely.
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Reducing spit-up
Spit-up, also known as reflux, is a common occurrence in infants and is usually not a cause for major concern. It happens when the contents of the baby's stomach flow back into the oesophagus and sometimes out of the mouth. This is due to the immaturity of a baby's digestive system and the underdeveloped valve between the stomach and the oesophagus, which is responsible for keeping food down.
Sleeping Position
It is recommended to place your baby on their back to sleep, as this is the safest position to reduce the risk of Sudden Infant Death Syndrome (SIDS) and ensure they can easily clear spit-up. You can also elevate the head of the crib slightly with a firm wedge or pillow under the mattress, ensuring it is never directly under the baby, to keep their head higher than their stomach.
Burping Techniques
Proper burping during and after feeding can help reduce the amount of air swallowed, which contributes to spit-up. Try to gently burp your baby during and after each feeding session.
Feeding Techniques
Adjusting feeding techniques can help reduce spit-up. Ensure your baby is positioned properly during feeding, with their head slightly elevated. Avoid overfeeding and allow your baby to feed at their own pace. Feeding more frequently but with smaller amounts is also recommended, as babies will spit up more with a full stomach.
Formula
If you are formula-feeding, consider switching to a formula designed to reduce spit-up, such as Enfamil A.R., which has a thicker consistency with added rice starch. Always check with your child's paediatrician before making any changes to their formula.
Dietary Adjustments
For babies with milk protein intolerance, changing to a soy-based, hypoallergenic, or amino acid-based formula may be beneficial. For breastfed babies, the mother may consider avoiding dairy and/or soy in her diet, as cow's milk is a common food sensitivity. However, it is important to consult a doctor or paediatrician before making any significant dietary changes.
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When to seek help
While spitting up during sleep is a common occurrence in newborns, there are certain situations in which you should seek medical help.
Firstly, it is important to understand the difference between spitting up and vomiting. Spitting up usually does not require force or discomfort, whereas vomiting is more forceful and can indicate that your baby is unwell. If your baby is vomiting, particularly if it is forceful, you should seek medical advice.
Secondly, if your baby is spitting up excessively, seems uncomfortable, or is not gaining weight properly, you should consult your pediatrician. This could indicate an underlying issue such as gastroesophageal reflux (GER) or allergies. If your baby is frequently vomiting, especially if it is forceful, and accompanied by other symptoms such as poor weight gain, you should also seek medical advice.
Additionally, if your baby is choking, this is a medical emergency. If your baby is choking, you should start baby CPR and call emergency services.
It is important to note that the American Academy of Pediatrics (AAP) recommends that babies always sleep on their backs, even if they frequently spit up, to reduce the risk of Sudden Infant Death Syndrome (SIDS). This position does not increase the risk of choking, and babies may even clear fluids better when on their backs.
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Frequently asked questions
Yes, it is relatively normal for newborns to spit up or even throw up while sleeping. This happens because their digestive systems are still developing, and their small stomachs and immature esophageal sphincters can cause milk to come back up, especially after feeding.
It is recommended to place your baby on their back to sleep, as this is the safest position to reduce the risk of Sudden Infant Death Syndrome (SIDS) and ensure they can clear spit-up easily. You can also elevate the head of the crib slightly with a firm wedge or pillow under the mattress, but never directly under the baby. Additionally, proper burping during and after feeding can help reduce spit-up by minimizing the amount of air swallowed.
Spitting up does not usually mean that your baby is full and they may still be hungry. You can continue feeding your baby after they spit up, but it is a good idea to pause and burp them first to help reduce the chances of more spit-up.
While spitting up is common and usually harmless, it can become a cause for concern if it turns into forceful vomiting or is accompanied by other symptoms such as poor weight gain or choking. If you notice any of these symptoms, consult your healthcare provider for advice.










































