Reflux and spit-up in babies

0–6 months · Health · Reviewed 18 June 2026 · All articles

If your newborn regularly brings up milk after a feed, you are far from alone. Spitting up is one of the most common concerns in the first months of life, and for the vast majority of babies it is entirely normal. Understanding why it happens, what to look out for, and when to seek help can make those messy feeds feel a lot less worrying.

What is reflux, and why does it happen?

Reflux in babies refers to the movement of stomach contents back up into the oesophagus (the tube connecting the mouth to the stomach). The medical term is gastro-oesophageal reflux, or GOR. In many babies this results in spit-up or posseting: small amounts of milk that come back up, often shortly after a feed.

The main reason babies are so prone to reflux is the immaturity of the lower oesophageal sphincter (LOS). This ring of muscle sits at the junction between the oesophagus and the stomach, and its job is to keep stomach contents from flowing back up. In newborns, this muscle has not yet fully developed its tone and control, so it opens more readily than it should. Combined with the fact that babies spend much of their time lying flat and have liquid-only diets, the conditions are ripe for frequent spit-ups.

According to the NHS, around half of all babies bring up milk at least once a day in the first few months. This is so common that it is considered a normal developmental stage rather than an illness. The peak age for reflux is typically around four months, after which most babies gradually improve as the sphincter matures and they begin spending more time upright.

GOR versus GORD: knowing the difference

GOR (gastro-oesophageal reflux) and GORD (gastro-oesophageal reflux disease) are related but distinct. GOR is the normal physiological process described above: milk or stomach acid travels up the oesophagus, and the baby may or may not spit it out. It is common, it is largely harmless, and it resolves on its own.

GORD is diagnosed when reflux causes complications or distress that go beyond the ordinary. According to NICE guidelines, GORD may be suspected when there is poor weight gain or weight loss, significant apparent pain, refusal to feed, respiratory symptoms such as wheezing or recurrent chest infections, or when symptoms persist beyond 12 months. GORD is considerably rarer than GOR and requires formal medical assessment. Treatment options range from feeding adjustments to thickened feeds and, in more serious cases, acid-suppressing medication prescribed by a doctor.

It is worth noting that the AAP (American Academy of Pediatrics) also draws a clear line between the two: GOR is described as a normal process in otherwise healthy infants, while GORD involves symptoms that affect quality of life or cause complications.

Silent reflux: what it is and how to spot it

Not all reflux is visible. Silent reflux is the term used when stomach acid or milk travels up the oesophagus but is swallowed back down before it reaches the mouth. Because there is no obvious spit-up, silent reflux can be harder to identify, yet it can still cause discomfort.

Signs that your baby may be experiencing silent reflux include: arching the back or pulling away during or after feeds, excessive hiccupping, frequent swallowing or gulping (especially between feeds), a hoarse or raspy cry, a persistent cough that does not seem related to a cold, and apparent discomfort or crying when lying flat. Babies with silent reflux may also refuse feeds or want to feed very frequently as a way of soothing the burning sensation.

If you notice several of these signs consistently, it is worth speaking to your GP or health visitor. They may observe a feed, check your baby's weight gain, and decide whether any investigation or management is needed. A diary of feeding times, feed amounts, and symptoms can be a very useful tool to bring to this appointment.

Practical tips to reduce spit-up

While there is no way to eliminate reflux entirely in the early months, a number of practical steps can help reduce its frequency and severity. The following are in line with NHS and AAP guidance.

Feed in an upright position. Holding your baby at a 45-degree angle or more during feeds means gravity can help keep milk in the stomach. If bottle-feeding, use a slow-flow teat to reduce the rate of milk intake and the amount of air swallowed.

Wind your baby carefully. Trapped air in the stomach can push milk upward. Take time to burp your baby during and after each feed, particularly during breastfeeding pauses or between bottle portions. Gentle upright holds or slow back-patting work well for most babies.

Keep your baby upright after feeds. The NHS recommends keeping babies upright for a period after feeds. Avoid immediate lying-down or vigorous activity straight after eating. A sling or carrier can be helpful here as it naturally keeps your baby upright against your chest.

Avoid overfeeding. Smaller, more frequent feeds give the stomach less to push back up. If bottle-feeding, speak to your health visitor about appropriate amounts for your baby's weight and age.

Check your breastfeeding latch. A poor latch can cause a baby to swallow excess air, which increases reflux. A midwife or breastfeeding support worker can check the latch and suggest adjustments.

Avoid tight clothing and pressure on the tummy. Nappy changes, tummy time and sitting positions that put pressure on the abdomen straight after a feed can trigger spit-up.

Consider your own diet if breastfeeding. Some parents notice that certain foods seem to worsen reflux. While the evidence is not conclusive, if you suspect a link, keep a food and symptom diary and discuss it with your health visitor or GP before eliminating foods unnecessarily.

When to see a doctor

The NHS advises contacting your GP or health visitor if you are concerned about your baby's reflux. However, there are specific signs that warrant prompt medical attention rather than a routine appointment.

Seek help promptly if your baby: is not gaining weight or is losing weight; vomits forcefully in large quantities (sometimes called projectile vomiting); has blood or bile (green fluid) in the vomit; has blood in their stools; appears to be in significant pain, is inconsolable or has a high-pitched cry; has difficulty breathing, wheezing or a persistent cough; chokes or gags regularly; or is refusing feeds repeatedly. These symptoms may point to GORD, pyloric stenosis (a narrowing of the stomach outlet that causes forceful vomiting in the first weeks of life), or another condition that needs investigation.

If reflux continues to worsen rather than improve after six months, or if it has not resolved by 12 months, speak to your GP. By this age most uncomplicated GOR has settled on its own, so persistence beyond this point is worth investigating.

The key reassurance is this: a baby who is gaining weight well, feeding regularly, and not in apparent distress is very unlikely to have anything serious causing their spit-up. But you know your baby best, and if something feels wrong, trust that instinct and seek advice.

Frequently asked questions

Is it normal for my baby to spit up after every feed?

Yes, for most babies it is entirely normal. The NHS estimates that around half of all babies bring up milk at least once a day in the early months. As long as your baby is gaining weight well, seems comfortable and is not distressed, frequent small spits are not a cause for concern.

What is the difference between GOR and GORD?

GOR (gastro-oesophageal reflux) is the normal, common process where stomach contents move upward into the oesophagus. It becomes GORD (gastro-oesophageal reflux disease) when it causes complications such as poor weight gain, significant pain, breathing problems or damage to the oesophagus lining. GORD is far less common and requires medical assessment and treatment.

How do I know if my baby has silent reflux?

Silent reflux means stomach contents come back up but are swallowed again rather than spat out, so there is no visible spit-up. Signs can include arching of the back during or after feeds, persistent hiccupping, frequent swallowing or gulping, hoarse cry, apparent discomfort when lying flat, and reluctance to feed. If you notice these signs consistently, speak to your health visitor or GP.

When should I take my baby to see a doctor about reflux?

Seek medical advice if your baby is not gaining weight adequately, is vomiting forcefully or in large amounts, has blood in the vomit or stool, seems to be in significant pain, has breathing difficulties, or if spit-up persists or worsens after six months. The NHS advises contacting your GP or health visitor promptly for any of these warning signs.

Will my baby grow out of reflux?

Most cases of GOR in infants resolve on their own as the digestive system matures. According to the NHS, reflux usually improves by the time a baby is 12 months old, and many babies see significant improvement once they are able to sit up and begin solid foods around six months. Treatment is rarely needed for uncomplicated GOR.

Track feeding and spit-up patterns from day one

Track your baby's feeding, spit-up patterns and weight gain from day one when your baby arrives.

Start free