Vomiting in Infants: Reflux, Stomach Bug, or Something Else? (1-12 months)

Your baby spits up milk after a feed. A few hours later, it happens again. Is this normal spit-up, reflux, a stomach infection, or something that needs medical attention?

Bringing up small amounts of milk is common during the first year of life and, in many babies, is simply part of an immature digestive system. Vomiting is different and can happen for several reasons, ranging from a short-lived illness to, less commonly, a condition that needs prompt treatment.

Recognising what the incident involves, how often it happens and how your baby is feeding and behaving can help you decide what to do next. This article explores the causes of vomiting in infants, important warning signs, and practical steps for caring for your baby when they are unwell.

Spit-Up or Vomiting: How Can You Tell the Difference?

Spit-up, also called regurgitation, typically happens effortlessly. A small amount of milk may flow out of your baby's mouth during or shortly after a feed. If your baby is otherwise comfortable, feeding normally and growing well, occasional spit-up is generally not a cause for concern.

Vomiting tends to involve a more forceful expulsion of stomach contents. It may happen once during a minor illness or recur alongside other symptoms. The distinction isn't always obvious from the amount of milk you see. Instead, pay attention to how it comes up, how frequently it happens and how your baby seems afterwards.

When Vomiting After Feeding May Be Reflux

Reflux occurs when milk or other stomach contents travel back up into the oesophagus and sometimes into the mouth. It is particularly common in young babies and usually becomes less frequent as the digestive system matures.

Common infant reflux symptoms may include:

● Milk or stomach contents coming back up during or shortly after feeds.

● Hiccups or coughing around feeds.

Most babies with simple reflux remain comfortable, continue feeding and gain weight as expected. Fussiness, crying, or unsettled behaviour by themselves are not always caused by reflux, as many factors can lead to these symptoms.

If vomiting after feeding in infants becomes frequent or forceful, or begins to affect feeding or growth, it should be evaluated rather than assumed to be ordinary reflux.

When a Stomach Infection May be the Cause

A stomach infection, most often viral, typically presents differently than simple spit-up or reflux. Vomiting may begin suddenly, and the baby may develop diarrhoea, reduced appetite or fever and seem generally unwell.

Not every episode of vomiting with diarrhoea is necessarily a stomach infection, so persistent or concerning symptoms should be discussed with a paediatrician.

When Vomiting Needs Urgent Medical Attention

While many episodes of vomiting in babies are short-lived, certain symptoms need prompt medical assessment. This is particularly important in younger infants, who can become unwell more quickly.

Seek medical attention if your baby:

● Has green or yellow-green vomit.

● Has blood in the vomit.

● Is struggling to keep fluids down.

● Has a swollen or unusually tender abdomen.

● Has noticeably fewer wet nappies or a dry mouth.

● Is difficult to wake, less responsive than usual or appears very unwell.

A temperature of 38°C or higher in a baby under 3 months also requires prompt medical assessment. Repeated or increasingly forceful/projectile vomiting, particularly in a young infant, needs prompt assessment. In some cases, doctors may need to rule out conditions such as pyloric stenosis.

Other Causes of Vomiting in Babies

Reflux and stomach infections are common explanations, but they are not the only causes of vomiting in babies. Depending on the baby's age and other symptoms, vomiting may sometimes be associated with:

● Food allergy or intolerance.

● Infections elsewhere in the body.

● Coughing or gagging that triggers vomiting.

● Less commonly, a problem affecting the digestive tract.

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Keeping Your Baby Hydrated

Babies can lose fluids quickly when vomiting, especially if they are having diarrhoea too. Your main goal is to keep your baby well-hydrated and watch carefully for any changes in feeding habits or urine output.

If you are breastfeeding, continue to breastfeed unless your healthcare professional advises otherwise. If your baby is formula-fed or vomiting frequently, speak to your paediatrician about how to maintain adequate hydration. Avoid giving large amounts of plain water or changing your baby’s feeds without medical guidance, especially in young infants.

If vomiting continues or your baby is taking much less milk than usual, contact your paediatrician for guidance on maintaining hydration safely.

Understanding What Your Baby's Vomiting May Mean

Bringing up milk is common during infancy, but not every episode should be treated in the same way. Ordinary spit-up usually settles as babies grow, while illness-related or unusual vomiting may need medical attention. If you're unsure about what you're seeing or your baby doesn't seem like their usual self, speak with your paediatrician.

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