Silent Reflux in Babies
Silent reflux is not a formally recognised term in the medical literature, but it is commonly used among parents visiting our Paediatric Allergy clinic. The term Gastro-oesophageal Reflux/Disease is more widely used, but regardless, parents use these terms to describe ‘silent, i.e. without visible regurgitation, symptoms that may include:
Feeding refusal
Irritability (especially during or after feeds)
Back arching / Leg drawing (flexion)
Choking, gagging, or coughing and may smell of sick / vomit when this happens
Gurgling and swallowing of the sick
Unexplained or inconsolable crying (with painful tears), i.e. not so silent!
More Concerning Findings
While less common, some infants may also experience:
Food/feeding refusal
Hoarseness or a chronic cough
Respiratory symptoms such as wheezing or recurrent pneumonia
Growth faltering or "failure to thrive" (in more severe cases)
Blood specs in vomit
What Is Silent Reflux and how to manage it?
Silent reflux is when stomach contents come back up into your baby's throat or oesophagus, but your baby does not visibly spit up or vomit. Because there is no visible "spit up," it can be harder to recognise. The condition is frequently suspected and hence a common presentation in our Allergy Clinic. We follow international guidelines when investigating the condition.
Key Points for Parents:
It usually gets better on its own. Silent reflux typically starts before 8 weeks of age, peaks around 4 months, and resolves by 12 months as your baby's digestive system matures.
Watch for subtle signs. Since babies cannot tell you they are uncomfortable, look for fussiness during or after feeds, back arching, feeding refusal, coughing, or choking—even without visible spit-up.
Simple changes can help. Hold your baby upright for 20–30 minutes after feeding, offer smaller and more frequent feeds, and burp your baby correctly during feeds.
Most babies do not need medication. Reflux is very common and usually does not require testing or medicine. We will assess whether there is an allergic component to the symptoms and whether medication is needed to reduce stomach acid production. Antacids may transiently neutralise gastric acid, but they do not address the underlying mechanism of reflux, which is primarily due to physiologic immaturity of the lower oesophageal sphincter in infants. The medical literature demonstrates inconclusive evidence for symptom improvement with antacids; most studies show no benefit over placebo for regurgitation, crying, or distress in infants with reflux.
Know when to call your doctor. Contact your paediatrician or come see us in clinic if your baby has forceful or green vomiting, blood in spit-up, poor weight gain, refuses to eat, or seems very uncomfortable.
Baby with reflux
Frequently Asked Questions
-
Feeding refusal (reflux can be very painful, and its a central deep pain, moms often remember this well from during pregnancy!)
Irritability (especially during or after feeds)
Back arching, and hip flexion, often going rigid with pain/discomfort.
Choking, gagging, or coughing and may smell of sick when this happens
Unexplained or inconsolable crying (with painful tears)
Severe Findings
While less common, some infants may also experience:
Food/feeding refusal
Hoarseness or a chronic cough
Respiratory symptoms such as wheezing or recurrent pneumonia
Growth faltering or "failure to thrive" (in more severe cases)
-
The first-line therapy is parental reassurance.
Reassuringly, symptoms nearly always settle as your baby grows and the lower oesophageal sphinctor strengthens (it is just a muscle after all)
Trial feeding modifications
Smaller, more frequent feeds
In formula-fed infants, thickened feeds., but these can constipate and practically can be difficult to work with
Extensively hydrolysed Rice or milk-based amino acid-based formulas may be considered for infants with suspected cow’s milk protein allergy. Hydrolysed rice milk formula is thought to be more palitable than most modified infant formula.
Maternal elimination of dairy may be trialled in breastfed infants. The major Allergy Societities discourage this but many parents have already trialled dietary eliminations before attending our clinic. In our expeience, some babies will be more comfortable with maternal dietary modification, but this needs to be monitored by a Dietitian. We discourage multiple allergen avoidance in moms diet, this seldom ever helps.
NB! Positional therapy is not recommended due to safe sleep guidelines which encourages sleeping on the back. Elevated cots can result in the baby slipping to the base and being coveed by blankets, a known risk for cot death.
However, if your baby has productive reflux, and especially of they are tightly swaddled, it can be difficult for them to deal with any reflux which willl have to be swallowed. Loose swaddling may be more soothing and safer.
The stomach anatomy allows for easier reflux into the oesophagus when laying on the RHS, so keep this in mind when posistioning your baby
-
Pharmacological treatment (H2 blockers or PPIs) is reserved for infants with confirmed GORD who do not respond to conservative measures and have significant symptoms or complications.
Acid suppression does not stop the mechanical propcess of vomiting, but will reduce pain and acid irritation (which itself may calm the mucosa and nerves down in an irritated lower oesophagus).
Acid suppression should be used for the shortest duration possible (typically 4–8 weeks)
If Acid supression hads not unequivocally helped after at least 3-4 days, then there may be little point in continuing, but discuss with your Doctor. A positive response is normally very obvious to all, especially tired parents.
Acid suppression is not adequate for non-acid reflux and carries risks, including infection and altered microbiome with possioble links to subsequent allergy development.
-
The following "alarm symptoms" are not typical of silent reflux and warrant urgent evaluation for alternative diagnoses:
Bilious (green) vomiting
Hematemesis (blood in vomit)
Persistent, forceful vomiting
Important: Growth faltering should always prompt further evaluation for underlying pathology.
Worried About Allergies? Let’s Help You Get Answers
If your child is showing signs of a food, pollen, or skin allergy, early diagnosis is key. At London Allergy Consultants, our expert team provides trusted, evidence-based care tailored to your child’s needs. From testing to treatment plans, we guide you every step of the way.
London Allergy Consultants
London Allergy Consultants is a leading UK centre for diagnosing and treating food and airborne allergies in children and young people.
Get in Touch
Walnut allergies are a leading cause of nut-induced allergic reactions, including anaphylaxis.
There is a high risk of "co-allergy" with pecans due to nearly identical protein structures, so allergy (or tolerance) to one usually implies an allergy (or tolerance) to the other, akin to being close ‘first cousins’.
Wlanut and Pecan allergies are rarely outgrown and typically require lifelong vigilance and, in the absence of OIT, the constant presence of an epinephrine auto-injector or Neffy device.
Oral Immunotherapy (OIT) is an emerging treatment option for Walnut and Pecan Allergy. We offer this service.