Why Is My Baby Vomiting After Feeding? Common Causes and What Parents Can Do

Is your baby vomiting after feeding? It can be distressing, but don’t panic. 

Many cases of supposed vomiting after baby feeding are actually just normal post-meal spit-ups. There’s a difference between those and actual vomiting.

In this guide, we’ll help you figure out which is which, so that you can better tell when it’s actually time to rush the little one to a paediatrician.

The Difference Between Baby Spit-Up and Vomiting

Many Singaporean parents use the terms “spit-up” and “vomiting” interchangeably, but the two are very different physiological actions.

Spit-up is just the easy flow of stomach contents back up through the mouth. It’s often accompanied by a burp and typically occurs right after baby feeding or burping. 

The liquid from spit-up can look like the milk that was just fed, but it can also appear slightly curdled if it has already mixed with stomach acid. 

Generally, spit-up happens because your baby is still growing. The muscular valve between the oesophagus and stomach may not be fully developed yet, which is why food sometimes comes back up through it. This is also why the frequency of spit-up typically lessens as the baby grows.

In contrast, vomiting is much more forceful. It often involves a larger volume of fluid and can be either sudden or repeated. It also usually involves more visible discomfort from your baby.

Spitting up is a developmental milestone that many infants outgrow, but persistent vomiting is often a sign of an underlying medical concern that may need assessment from a doctor.

Common Reasons for Spitting Up and How to Manage Them

Developing Digestive System and Acid Reflux

This is probably the most frequent cause of spit-up. The ring of muscle that keeps food in the stomach is just not tight enough yet to do the job properly in an infant, so milk slides back up.

To try and manage this, keep your baby in an upright position for at least 20 minutes after they’re done with the baby feeding bottle. Gravity can help them keep the milk down while the stomach starts digesting.

Overfeeding

This is another fairly common cause of spit-up. It comes from parents misinterpreting the “rooting” reflex (an apparent search for a nipple to latch onto) as hunger. 

However, rooting can actually happen for reasons other than hunger. Sometimes, a baby will root simply to comfort themselves with touch. 

If you end up overfeeding the baby after confusing rooting with a search for the bottle, their stomach may be stretched beyond capacity, so the milk has nowhere to go but back up.

To avoid this, try to stick to smaller and more frequent feeds throughout the day. You can also use a slow-flow teat if bottle-feeding. Finally, try to get a sense for when your baby is actually hungry or just seeking comfort.

Swallowing Air During Feeds

Whether breastfeeding or bottle-feeding, babies often swallow air along with milk. It can get trapped in the stomach and eventually lead to the stomach forcing it out with a burp. Sometimes, that burp can come with milk, which is the spit-up.

Burp your baby frequently, even in the middle of a feed, to release air bubbles before they build up. For bottle-fed babies, ensure the teat is full of milk so they aren’t sucking in air from the bottle.

Lying Flat Too Soon

It can be tempting to lay the baby down in the cot immediately after a feed if you have a lot of chores to get to. Unfortunately, this horizontal position makes it more likely for stomach contents to leak back up.

Use a bouncer or hold your baby up against yourself with a sling to maintain an incline after meals. Even a slight elevation of the head can significantly reduce the amount of spit-up a baby produces.

Sensitivity to First Solids

If you’ve recently started weaning your baby onto solids (usually around six months of age), their digestive system may react to the new textures or ingredients negatively at first. It can overwhelm their stomachs and lead to mild reflux.

Stick to the four-day rule most parents follow. This means you should only introduce one single-ingredient food every four days to monitor for reactions.

Common Causes of Baby Vomiting After Feeding

Forceful Overfeeding

While overfeeding usually causes a gentle spit-up, an extremely full stomach can sometimes trigger a more forceful expulsion of milk. This happens when the stomach muscles contract sharply to push out excess volume.

Pay close attention to your baby’s fullness cues. Different babies have different cues, but most do things like turn their head away or slow down the sucking. Once you recognise those, you can better prevent your baby from feeding to the point where they vomit.

Formula Intolerance or Food Sensitivity

Vomiting can be a sign that your baby is sensitive to a specific protein in their formula or a newly introduced solid food. Unlike simple spit-up, it often comes with fussiness or changes in bowel movements.

Try to consult your GP or paediatrician for advice on diet changes, especially for formula issues. They may recommend alternatives if an allergy is suspected, for instance.

Gastroenteritis and Stomach Bugs

Gastroenteritis or stomach flu is a viral infection that causes sudden, repeated vomiting and often diarrhoea. This is often easier to notice if other babies or people in the same area have the same symptoms (e.g. other babies in an infant care centre).

If your baby has the bug, focus on preventing dehydration. Offer frequent, small sips of milk or an oral rehydration solution. Seek medical help if the vomiting lasts for more than 24 hours as well.

Underlying Medical Issues

In rare instances, persistent vomiting can be caused by medical conditions like pyloric stenosis, where the opening between the stomach and small intestine narrows abnormally. This often results in projectile vomiting that travels a fair distance!

Cases like this are fairly unusual, of course, but it never hurts to get a doctor’s opinion or assessment.

When to Seek Urgent Medical Care

As a parent, your “gut feeling” is often a good indicator of when something may need further medical checks.

That aside, there are some other signs that may warrant a trip to the nearest A&E (or at least a call to your doctor):

• Bright green or yellow vomit (indicates the presence of bile, which could signal intestinal blockage)

• Blood, whether brown or red, in the vomit

• Persistent or projectile vomiting

• Signs of dehydration, e.g. dry mouth or a sunken soft spot on the head

• Lethargy, especially if the baby is suddenly difficult to wake

• A bloated or swollen abdomen

• A high fever

• Poor weight gain

• Struggling at every feed

Some Reassuring News for Parents

Ultimately, it’s important to stay calm. Most cases of throwing up are actually just normal spit-ups, and they’re part of growing up. 

If your baby is happy, gaining weight, and hitting milestones, your little one is likely fine. You just have to observe carefully to determine if medical help is already necessary.

If you want more advice like this from other parents, check out our other articles! They’re full of helpful tips and guides from other Mummy Guru mums and dads!