Baby reflux: what's normal and when to get help

It is 2am, your baby has just brought up half a feed down your shirt, and you are wondering whether this is normal. For most families, it is.

Reflux is one of the most common baby health concerns in the first year, and one of the most over-treated. This guide separates ordinary posseting from the complications that need a doctor, and explains what actually helps. It is general information, not a diagnosis.

What reflux actually is#

Reflux, or gastro-oesophageal reflux (GOR), is when milk comes back up from the stomach into the food pipe or mouth. In babies, the valve at the top of the stomach is still developing, so it opens more easily. Most of the milk goes back down. Sometimes it comes out as a small posset or a larger vomit.

Reflux is extremely common. Red Nose notes that it affects up to half of babies under three months and about 70% of healthy babies under one year. It usually improves as babies grow, sit up and spend more time upright. Red Nose says it stops completely within 12 months for around 95% of babies.

A baby who possets after feeds but is otherwise well, growing and comfortable does not need treatment. That is normal baby behaviour, not a disease.

Normal posseting versus GORD#

The word reflux gets used for everything from a small milk stain to a baby who is struggling. The distinction that matters is whether reflux is causing complications. When it does, it is called gastro-oesophageal reflux disease (GORD).

GORD can also cause recurrent chest infections, hoarseness, disrupted sleep and feeding aversion. These are not things to diagnose at home. Your GP or child and family health nurse will check growth, feeding and your baby's history, and decide whether a referral is needed.

What about "silent reflux"?#

"Silent reflux" is not a recognised diagnosis. The idea is that a baby refluxes without visible vomiting, but the evidence does not support using this label to explain crying or unsettled behaviour. Babies cry for many reasons: hunger, tiredness, overstimulation, wind, a feeding problem, illness or normal developmental crying. If your baby is very unsettled, get an assessment rather than guessing at silent reflux.

Feeding changes that can help#

For ordinary reflux, small adjustments are usually enough. None of them are a cure, and none should be drastic.

• Feed responsively. Watch for early hunger cues and feed before your baby is frantic. A very hungry baby may gulp a lot of air.
• Avoid pushing extra milk. If your baby turns away, stop. Overfeeding makes reflux worse.
• Use paced bottle feeding. Hold the bottle more horizontally, let your baby set the pace, and pause for breaks. Check that the teat flow is not too fast.
• Burp during and after feeds. Some babies need a burp halfway through; others do not. Follow your baby, not a rule.
• Keep your baby upright for about 20 minutes after a feed. A supported upright cuddle or a baby carrier works. This is not the same as propping them in a seat to sleep.
• Avoid tight waistbands and nappies. A tight nappy or waistband can increase pressure on the tummy.
• Check formula preparation. Follow the tin exactly. Too little water makes formula concentrated and can cause constipation or dehydration. Too much water is also dangerous.
• Try smaller, more frequent feeds if your baby seems uncomfortable after large feeds.

If you are breastfeeding, there is no need to stop. Reflux is not caused by your milk. If you suspect a food trigger, talk to your GP before eliminating foods, because elimination diets can affect your nutrition and your milk supply.

What does not help, and can be harmful#

• Changing formula without advice. It rarely fixes reflux and can cause unnecessary disruption.
• Thickening feeds with rice cereal or commercial thickeners unless advised. Pre-thickened formula can help some babies with GORD, but it needs medical guidance and can cause constipation.
• Eliminating dairy or soy from your diet without a plan. This is only appropriate if a cow's milk protein allergy is suspected and managed by a clinician.
• Acid-suppressing medicine bought online or borrowed from another child. These medicines are not harmless, and they do not treat normal posseting.
• Sleeping your baby inclined, on a wedge, in a rocker or in a car seat. This is a suffocation and SIDS risk. More on this below.
• Keeping your baby awake upright for hours. It will not stop reflux and it will make everyone miserable.

Sleep safety with a refluxy baby#

This is the part where well-meaning advice can be dangerous. Reflux is not a reason to change how your baby sleeps.

Red Nose is clear: babies with reflux should be placed on their back from birth, on a firm, flat mattress that is not tilted or elevated. Tilting the cot does not reduce reflux. A baby can slide down a tilted surface and become covered by bedding, and a pillow or wedge can cause their chin to drop towards their chest and block the airway.

So:

• Always place your baby on their back for sleep.
• Use a firm, flat mattress with a well-fitting sheet.
• Keep the cot clear: no pillows, wedges, bumpers, soft toys or loose bedding.
• Do not use a rocker, bouncer, swing or car seat for unsupervised sleep.
• If your baby falls asleep in a carrier or pram, keep them supervised and move them to a safe sleep surface when you can.
• If a doctor says your baby must not sleep on their back for a medical reason, ask for that advice in writing and follow the safe sleep plan they give you.

After a night feed, burp your baby, keep them upright for a short cuddle if they need it, then settle them back on their back. You do not need to hold them upright for 30 minutes at 3am unless your clinician has told you to.

Our safe sleep guide explains the full set of recommendations, including room sharing and temperature.

Reflux and starting solids#

Starting solids does not cure reflux, but it can help some babies as they spend more time upright and their diet changes. The usual advice still applies: wait for the signs of readiness, usually around six months and not before four months.

Do not add cereal to a bottle to "thicken" it unless your GP or child and family health nurse has told you to. Do not start solids early to treat reflux. If your baby has severe eczema or a family history of allergy, talk to your GP before introducing common allergens.

Our guide to starting solids in Australia covers readiness, first foods and allergen introduction. If you are combination feeding or bottle feeding, the baby feeding schedule guide has practical guidance on volumes and paced feeding.

Cows' milk allergy and other causes#

Some babies with severe reflux, feeding difficulties, poor weight gain, blood or mucus in their poo, or severe eczema have a cow's milk protein allergy. This is not the same as lactose intolerance, and it is not something to diagnose by switching formulas at home. Our cow's milk allergy and lactose intolerance guide explains the difference and why lactose-free formula is not a treatment.

Other causes of persistent vomiting include infections, pyloric stenosis (projectile vomiting in a young baby, usually two to eight weeks old), and rare metabolic or neurological conditions. These are uncommon, but they are why persistent or forceful vomiting needs a proper look.

If you suspect an allergy, see your GP or a paediatrician. Our baby food allergy guide explains the signs and the referral pathway.

The mental load#

A baby who possets constantly, cries during feeds or will not settle can leave you exhausted and doubting yourself. That is a real health issue, not a character flaw.

If you are not sleeping, feeling anxious or low, or dreading feeds, tell your GP or child and family health nurse. Support is available, and treating parental mental health matters for the whole family. Our guide to perinatal mental health explains the signs and where to get help in Australia.

When to get help#

See your GP or child and family health nurse if your baby:

• is not gaining weight or is losing weight
• is distressed, arching or crying during feeds
• is refusing feeds or feeding for much shorter periods than usual
• is coughing, choking, wheezing or having trouble breathing around feeds
• has blood or green (bilious) vomit
• is very unsettled and you are worried
• has reflux that is not improving by around 12 months

Call 000 or go to the nearest emergency department if your baby:

• has green or bloody vomit
• is struggling to breathe, is blue or grey, or has pauses in breathing
• is unusually floppy, hard to wake or unresponsive
• has a fever and is under three months old
• is showing signs of dehydration, such as no wet nappies, a sunken soft spot, no tears or a dry mouth
• has a severe allergic reaction, such as swelling of the face or lips, or trouble breathing

For urgent advice when it is not an emergency, call healthdirect on 1800 022 222.

The bottom line#

Most baby reflux is normal, messy and temporary. Feed responsively, keep your baby upright after feeds, check the bottle basics and give it time. Do not change formula, cut out foods or prop the cot without advice. If your baby is in pain, not growing, refusing feeds or having breathing problems, that is GORD until proven otherwise, and it deserves a proper assessment.