Seeing your baby vomit can be frightening, especially when it happens suddenly or looks different from the milk that usually comes back after a feed. The most useful questions are how the vomiting happened, what it looks like, and how your baby is behaving afterwards.
Small spit-ups are usually harmless. Green or bloody vomit, repeated forceful vomiting, dehydration, and a baby who seems unusually unwell are different. Knowing these vomiting red flags can help you decide when to get urgent medical care.
First, is it spit-up or true vomiting?
Spit-up, also called reflux or posseting, usually means a little milk flows gently from a baby’s mouth during or after feeding. It is common in healthy infants who feed well, have normal wet nappies, and gain weight.
True vomiting is a more forceful emptying of stomach contents. Your baby may retch, look uncomfortable, or bring up a larger amount. Watch for changes from their normal pattern rather than estimating volume from a wet muslin cloth.
For example, a happy six-week-old who dribbles milk after burping is different from one who repeatedly sends milk across the changing mat. The second baby needs medical assessment, even if they seem hungry again.
Vomiting red flags that need emergency help
Green vomit or blood in vomit
Clearly green vomit in a baby can indicate bile and possible intestinal obstruction or twisting. Go to an emergency department immediately, even if it happened only once. Yellowish milk is not necessarily bile, but if the colour is uncertain, seek urgent medical advice rather than waiting.
Blood in vomit, including bright red blood or material resembling coffee grounds, also needs emergency assessment. Swallowed blood sometimes explains small streaks, but parents cannot safely identify the cause at home.
A baby who appears seriously ill
Get emergency help if vomiting comes with breathing difficulty, blue lips, seizures, a baby who is floppy or extremely difficult to wake, a rash that does not fade under pressure, or cold, mottled skin. A swollen, painful abdomen or persistent inconsolable distress also warrants immediate assessment.
For a baby younger than three months, a temperature of 38°C or higher requires urgent medical evaluation. If your baby looks critically unwell, call emergency services.
When to contact a doctor the same day
Projectile vomiting in a young baby
Projectile vomiting means stomach contents shoot out forcefully rather than running down the chin. Repeated projectile vomiting in a baby, particularly in the first two months, can be a sign of pyloric stenosis. This narrowing of the stomach outlet prevents milk from passing through normally.
A baby with pyloric stenosis may vomit after feeding, become increasingly forceful over days, and still want more milk. Dehydration and poor weight gain can follow. Seek prompt, same-day medical assessment; a clinician may arrange an ultrasound. Simply changing formula will not treat a blockage.
Vomiting that keeps happening
Contact your GP, paediatrician, or urgent-care service if your baby repeatedly vomits, refuses feeds, or cannot keep milk down. This is particularly important in babies younger than three months. Infants can become dehydrated faster than older children.
Also seek advice if vomiting occurs with ongoing diarrhoea, worsening tummy pain, blood in the stool, poor weight gain, or a recent head injury. Not every episode of infant vomiting is caused by a stomach bug.
How to spot dehydration
Wet nappies can tell you more than trying to measure vomit. Warning signs include noticeably fewer wet nappies, none for around eight hours, a dry mouth, sunken eyes or soft spot, and unusual drowsiness. A baby who is no longer waking for feeds normally needs urgent assessment.
Keep a brief record of feeds, vomiting episodes, wet nappies, and temperature. Saying “three vomits since the morning feed and no wet nappy for eight hours” helps a clinician understand the situation quickly.
Do not wait for every dehydration sign to develop. If your baby’s intake is poor or their condition is deteriorating, contact a healthcare professional. Information about signs of dehydration in babies can help you recognise changes but cannot replace an examination.
Caring for a baby who seems otherwise well
If your baby has only brought up a little milk, remains alert, feeds normally, and has plenty of wet nappies, careful observation may be appropriate. Continue usual breastfeeding or correctly prepared formula. Smaller, more frequent feeds may help, and you should not force a baby to finish a bottle.
Burp gently and hold your baby upright while awake after feeding. For sleep, place them flat on their back on a firm, level surface. Never use pillows, wedges, or an elevated cot to prevent reflux.
If vomiting continues, ask a healthcare professional whether oral rehydration solution is suitable and how to offer it. Do not dilute formula, substitute juice for feeds, give anti-vomiting medicines without advice, or use plain water instead of milk in a young infant.
Vomiting from an uncomplicated stomach infection often improves within a day or two. Seek medical advice if it lasts beyond two days, or sooner when your baby is very young or worsening. Understanding baby reflux versus vomiting may also help you distinguish familiar spit-ups from a new illness.
Frequently asked questions
Is vomiting after every feed normal?
Small, effortless spit-ups can be common. Repeated true vomiting after most feeds is different and needs medical advice, especially when forceful or associated with feeding difficulties or slow weight gain.
What does green vomit in a baby mean?
Green vomit may be bile-stained and can signal intestinal obstruction. Seek emergency care immediately, even if your baby looks comfortable afterwards.
Can teething make a baby vomit?
Teething can cause drooling and discomfort, but should not be used to explain repeated vomiting, dehydration, fever, or a baby who appears ill. Seek advice if symptoms persist.
Should I stop breastfeeding after vomiting?
Usually not. Breastfeeding helps maintain hydration during a mild illness. Offer feeds more frequently if needed, but get prompt advice if your baby cannot keep feeds down or stops feeding.
When in doubt, focus on the pattern
Colour, force, hydration, and your baby’s overall behaviour help separate ordinary spit-up from vomiting that needs treatment. Green vomit, blood, repeated projectile episodes, or a baby becoming unusually sleepy are reasons to act promptly.
Seek emergency care for serious warning signs and same-day advice for persistent or changing symptoms. Guidance on fever in babies under three months can provide further context, but your own observations are valuable when explaining the problem to a clinician.