Baby Reflux: Signs, Causes, and What Actually Helps

Feed the baby. Baby seems uncomfortable during the feed. Baby arches their back, goes red, screams. You try winding them. They spit up. A lot. Or maybe they do not spit up at all but they still scream every time you put them down after eating. You are three weeks in and you have no idea whether this is normal, whether something is wrong, or whether you are doing something wrong.

There is a good chance what you are dealing with is reflux. It affects roughly 4 in 10 babies under a year old. Most of the time it is uncomfortable rather than dangerous, and it gets better on its own. But knowing what it is, what is driving it, and what you can actually do about it makes the whole thing considerably less miserable for everyone involved.

What Is Baby Reflux?

Reflux is what happens when milk travels back up from your baby's stomach into their oesophagus (the food pipe). Sometimes it comes all the way up and out as a visible spit-up. Sometimes it only travels partway and is swallowed back down. Either way, if stomach acid is involved, it burns, and that is what causes the distress.

The medical name is gastro-oesophageal reflux, or GOR. When it is causing significant pain or affecting growth, it is called GORD (gastro-oesophageal reflux disease). The difference matters, because GOR is normal development, while GORD is a medical condition that needs treatment. Most babies have GOR. Far fewer have GORD.

Why Does It Happen?

At the bottom of the oesophagus there is a ring of muscle called the lower oesophageal sphincter. Its job is to act as a one-way valve: food goes down, stays down. In adults this works reliably. In newborns, it has not finished developing yet. It is weak and floppy, and it does not always hold shut when it should.

Add to that the fact that babies spend most of their time horizontal, drink an entirely liquid diet, and have relatively small stomachs that fill and empty quickly, and you have a system that is structurally prone to reflux. It is not a flaw. It is just where babies are developmentally in those early months.

As the sphincter matures and babies start sitting upright and eating solid foods, the problem almost always resolves. Most cases improve significantly around six months and are gone by twelve months.

What Baby Reflux Actually Looks Like

Symptoms vary in type and intensity. Some babies have obvious signs. Others are harder to read. Here is what to look for:

The obvious signs

• Frequent spitting up or vomiting. Some milk after a feed is completely normal. Large volumes, or spitting up long after a feed, is more likely to be reflux.
• Arching the back during or after feeds. This is the baby trying to create distance between the burning sensation and the source. A classic reflux tell.
• Crying and distress during feeds. Feeding should not be a battle. If your baby starts, pulls off, cries, then wants to feed again only to repeat the cycle, reflux is worth considering.
• Refusing the breast or bottle. Once feeding becomes associated with pain, some babies start to resist. They are hungry, but they know what eating leads to.
• Bringing up milk that looks curdled. Stomach acid curdles milk. Finding curdled spit-up in the crib an hour after a feed is a sign that stomach contents are coming back up.

The less obvious signs

• Frequent hiccups or gulping. Both can be triggered by the irritation of acid in the oesophagus.
• A hoarse or croaky voice. Stomach acid damages the throat over time. A persistently hoarse cry in an otherwise healthy baby is worth mentioning to a GP.
• Disrupted sleep, especially when lying flat. Lying horizontal makes reflux worse. Babies with reflux often sleep poorly unless slightly elevated.
• Wet-sounding burps or breathing. Sometimes you can hear the milk gurgling in the throat.

Silent Reflux: The Harder-to-Spot Version

Here is the version that trips parents up most often. Silent reflux is when stomach contents travel up the oesophagus but are swallowed back down before reaching the mouth. There is no visible spit-up, which means there is no obvious sign that anything is wrong.

What you see instead is a baby who seems deeply unhappy after every feed, arches their back, feeds poorly, wakes constantly at night, and cannot be settled lying flat. Without the visible spit-up clue, it is easy to assume you have an unsettled baby with no discernible cause. Many parents spend weeks being told the baby is "just colicky" before someone identifies the underlying reflux.

If your baby has persistent feeding distress with no clear cause, and particularly if they are not gaining weight well, push your GP for a proper assessment. Silent reflux is real, it causes real pain, and it can be treated.

Reflux vs Colic: How to Tell the Difference

These two things get confused constantly, partly because they can both cause a screaming baby, and partly because the treatments are completely different. Getting it right matters.

Factor	Reflux	Colic
When it happens	During or shortly after feeds	Any time, often evenings, no feed trigger
Visible spit-up	Often, though not always (silent reflux)	Not typically
Back arching	Common	Less typical
Weight gain	May be affected if severe	Normal, baby thrives
Relief from wind	Limited	Passing gas often helps
When it resolves	Usually by 12 months	Usually by 3 to 4 months

For a deeper look at colic specifically, what it is and how to survive it, the baby colic guide covers it in full. Some babies have both, which is not impossible, just particularly exhausting.

What to Do at Home

There is a fair amount you can do to reduce the frequency and severity of reflux before reaching for medication. Most of it is about positioning and feeding adjustments.

During and after feeds

• Keep the baby upright during feeds. A more vertical position means gravity is working with you rather than against you. For bottle feeding, hold the baby at roughly a 45-degree angle.
• Upright for 20 to 30 minutes after feeds. Sit them on your knee, wear them in a carrier, walk them around. Do not lay them flat immediately after eating.
• Wind during feeds, not just at the end. Stopping to wind partway through, particularly with bottle feeding, prevents a full stomach being topped up with air that then forces milk upwards.
• Smaller feeds more often, for bottle-fed babies. A smaller volume has less pressure behind it. Feeding every two hours with less milk each time often reduces symptoms more than three-hourly bigger feeds.
• Pace the bottle feed. Slow-flow teats and holding the bottle more horizontally reduce the rate of milk flow, which means less air swallowed and less volume in the stomach at once.

Sleep position

• Slightly elevate the head end of the sleep surface. You can do this by placing a rolled towel or firm wedge under the mattress (not under the sheet, and not a pillow inside the crib). Even a small elevation can reduce nighttime symptoms. Safe sleep guidelines still apply: babies sleep on their back.
• Avoid the bouncy chair after feeds. It seems logical but actually makes things worse. The hunched position a bouncy chair puts the baby in increases abdominal pressure and pushes stomach contents up.

For breastfed babies

Positioning during breastfeeding can make a difference. Laid-back or reclined breastfeeding, where your partner leans back and the baby lies face-down on them, uses gravity to keep milk down. It also slows the flow rate for mothers with a strong let-down. If breastfeeding is already proving difficult, adding reflux to the mix is genuinely hard. A lactation consultant can advise on positioning adjustments specifically for reflux babies.

When to See a GP and What They Can Offer

If home adjustments are not working, or if the baby seems to be in significant pain, is not gaining weight well, or is refusing feeds consistently, see your GP. Do not feel like you are making a fuss. This is exactly what they are there for.

The GP will assess whether this is simple GOR that needs management, or GORD that warrants medication. They may suggest:

Infant Gaviscon

The most commonly prescribed first step. Gaviscon works as a thickening agent: it makes milk heavier so it is less likely to travel back up the oesophagus. It is mixed into feeds. It works for some babies but not all, and constipation is a common side effect, which is just trading one problem for another.

Thickened formula (for formula-fed babies)

Some GPs recommend thickened formulas like Aptamil Anti-Reflux or Cow and Gate Anti-Reflux. These work on a similar principle to Gaviscon. They should only be used on medical advice.

Omeprazole or ranitidine (acid suppressors)

If the issue is acid causing oesophageal pain rather than the volume of reflux, a proton pump inhibitor like omeprazole reduces stomach acid production. These take up to two weeks to reach full effect and are used when there is clear evidence of acid damage or significant pain. They do not stop the reflux itself, they just make the acid less harmful.

For guidance on when symptoms warrant same-day medical attention versus a routine GP appointment, the when to call the doctor guide covers the thresholds clearly.

The Practical Reality

Dealing with reflux in those early months is genuinely hard. It is sleep-disrupting, feed-disrupting, and emotionally draining. You spend every feed tense, anticipating the scream. You end every session smelling of spit-up. You do not know whether you are doing the right thing.

A few things worth holding onto: it gets better. The sphincter matures. Solid foods help. By six months most reflux has significantly improved. By twelve months the vast majority of babies are done with it entirely. You are not doing anything wrong. This is a structural immaturity in a developing digestive system, not a parenting failure.

In the meantime, protecting your sleep wherever possible is not a luxury, it is a survival strategy. A reflux baby and a severely sleep-deprived parent is a hard combination. Tag-team nights with your partner if you can. Accept all offers of help.

Frequently Asked Questions About Baby Reflux

How do I know if my baby has reflux or colic?

The clearest distinction is timing. Reflux distress is almost always tied to feeds: it happens during or shortly after eating, when stomach contents are being pushed back up. Colic tends to erupt at any time, often in the evening, with no obvious feeding trigger. A baby with reflux will often arch their back during or after a feed, refuse to continue eating, or spit up frequently. A colicky baby cries intensely but is otherwise growing well and feeding fine.

What is silent reflux in babies?

Silent reflux is when stomach acid travels up the oesophagus but is swallowed back down rather than being spat out. There is no visible vomiting, which is why it often goes undiagnosed for longer. Instead you see unexplained crying, back arching, feeding refusal, frequent swallowing or gulping, a hoarse voice, and disturbed sleep. If feeds are consistently distressing with no other explanation, silent reflux is worth raising with your GP.

Is baby reflux serious?

Most baby reflux is not medically serious. Uncomplicated reflux, where the baby spits up and is otherwise well and growing, is called GOR and is a normal part of development. It becomes GORD when it starts affecting growth, causes significant pain, or leads to complications. If your baby is not gaining weight, seems to be in persistent pain, or is refusing feeds consistently, see your GP.

What can I do at home to help a baby with reflux?

Hold the baby upright during feeds and for 20 to 30 minutes afterwards. For bottle-fed babies, offer smaller feeds more often. Wind the baby during feeds, not just at the end. Tilt the head end of the sleep surface slightly. Avoid the bouncy chair immediately after feeds. For breastfed babies, your partner's feeding position may help: laid-back breastfeeding uses gravity to keep milk down.

When does baby reflux go away?

For most babies, reflux improves significantly once they start sitting up unaided, around 6 months, and resolves almost entirely by 12 months as the lower oesophageal sphincter matures. The introduction of solid foods around 6 months also tends to help, as solids are less likely to reflux than milk.

What medication is used for baby reflux?

Infant Gaviscon is usually the first thing GPs prescribe. It works as a thickening agent, making milk heavier so it is less likely to travel back up. If Gaviscon does not help, or if the baby seems to be in significant acid pain, a GP may prescribe omeprazole, which reduces stomach acid production. Neither medication should be given without a GP assessment first.

The Bottom Line

Baby reflux is common, usually temporary, and manageable. Four in ten babies have it to some degree. The vast majority resolve without any medication once positioning adjustments are made and the digestive system catches up developmentally.

Know the signs, apply the practical steps, and see your GP if home management is not working or if there are any red flags. You are not overreacting by asking for help with this. A baby in pain at every feed is not something to just push through.