29 August 2026 · Veronica Chi
Business & Product Director · Mum of two
Why Does My Baby Spit Up When Burping?
Because the milk travels out with the air. A burp is a bubble rising through a stomach that is full of liquid, and the muscular valve at the top of a newborn's stomach has not finished developing, so a mouthful of milk comes along for the ride. It is normal, it happens to around half of all babies regularly, and it is not a sign that you burped her wrongly.
How much spit-up is normal?
Far less than it looks. A tablespoon of milk spreads across a shoulder in a way that suggests half the feed has come back, and parents consistently overestimate it — pour a tablespoon of water onto a cloth once and the illusion never quite recovers.
| What you see | What it means | Action |
|---|---|---|
| A mouthful with the burp, baby unbothered | Normal posseting | Change the cloth. Nothing else |
| Several small possets a day | Normal, particularly 2–4 months | Feed smaller and more often; hold upright after |
| Milk with a curdled look or sour smell | It sat in the stomach a while. Still normal | No action needed |
| Forceful or projectile vomiting | Not posseting | See a doctor |
| Green or yellow-green vomit, or blood | Not posseting | Seek medical help the same day |
| Possetting plus poor weight gain or feed refusal | Needs assessment | See a doctor |
The measure that matters is not volume but the baby. A cheerful baby who gains weight and possets constantly is well. A distressed baby who possets a little may not be.
How do you reduce it?
- Feed smaller amounts more often. Less volume in the stomach means less to come back up with the air.
- Wind partway through the feed rather than saving it all until the stomach is full.
- Hold her upright for twenty to thirty minutes after the feed, before any lying down, nappy change or car seat.
- Do not press her tummy against your shoulder. Lift her so the weight sits on her bottom and her chin clears your shoulder.
- Keep the handling gentle immediately after a feed. Bouncing, jiggling and vigorous play are for later in the hour.
- Check teat flow if she is bottle-fed, and latch if she is breastfed. Both change how much and how fast she takes.
Feed-side fixes
Is it spit-up or is it reflux?
Ordinary posseting and reflux are the same physical event on a spectrum. The word reflux gets used when it is frequent enough or uncomfortable enough to matter — when she arches, cries, refuses feeds or is not gaining weight. A baby who brings up a mouthful and then grins at you is at the harmless end of the same phenomenon.
Both peak around four months and are largely over by the first birthday, as the valve matures and she spends more of her day upright.
The distinction in full
When should you see a doctor?
- Forceful or projectile vomiting, especially if it is becoming more frequent.
- Green or yellow-green vomit, or any blood in vomit or stools.
- Weight gain that has slowed or flattened, or fewer wet nappies than usual.
- Refusing feeds, or distress at every feed rather than some.
- Possetting alongside eczema that is hard to control, mucus in stools, or persistent diarrhoea.
- A baby who is unusually floppy, feverish, or has a hard swollen tummy — the same day, not at the next appointment.
The laundry problem nobody warns you about
Three or four cloths a day is ordinary during the posseting months, and in a flat with no dryer the question is not how absorbent a cloth is but whether it is dry again by morning. That is the whole practical case for muslin over terry at this stage — an open weave takes a mouthful of milk, washes at 40 degrees and is ready on the rack overnight even in a wet season.
Bamboo Wash Cloth 4pc (Rustic Rainforest)S$25.00Shop now
Bamboo Swaddles (3pc)S$69.00Shop now
Maison Q Bandana Bib 2 Pc - Animal BalloonS$21.90Shop nowA 120cm swaddle folded into quarters covers a shoulder and a lap at once, which is the version most parents end up reaching for; a wash cloth handles a chin. Keep more of both in rotation than seems necessary, and keep one in every bag.
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Questions parents ask
Why does my baby spit up when I burp her?
Milk comes up with the air. The valve at the top of a newborn's stomach has not finished developing, so a bubble rising through a full stomach carries a mouthful of milk with it.
How much spit-up is normal for a baby?
A mouthful with a burp, several times a day, is normal — around half of all babies do it. A tablespoon spreads far enough to look like much more than it is.
How can I stop my baby spitting up when burping?
Feed smaller amounts more often, wind partway through rather than at the end, hold her upright for twenty to thirty minutes after, and keep your shoulder off her tummy.
Is spitting up the same as reflux?
They are the same event on a spectrum. It is called reflux when it is frequent or uncomfortable enough to matter — arching, crying, feed refusal or poor weight gain.
When is spit-up a problem?
Forceful or projectile vomiting, green vomit, blood in vomit or stools, poor weight gain, or feed refusal all need a doctor rather than a change of technique.
Sources
- NHS — Reflux in babies
- American Academy of Pediatrics — Burping, hiccups and spitting up
- HealthHub — Ministry of Health Singapore
This guide is general information, written to help you understand a topic and ask better questions — it is not medical advice and does not replace your own doctor, midwife or paediatrician. Anything that worries you about your baby belongs with them.