Why Your Baby's Reflux Isn't Getting Better (And What to Do This Morning)

Here’s what nobody told you: reflux in babies is often not just about how you feed. It’s about:

• What you’re eating — if you’re breastfeeding, your diet directly influences what your baby receives through your milk

• Which formula — if you’re formula feeding, the type of milk matters enormously

• What’s on the plate — once weaning has started, food combinations can drive reflux in ways that nobody warned you about

Here are three things that are quietly making it worse.

Reason 1: There could be an undiagnosed allergy driving it

Reflux is a symptom. And one of the most underrecognised causes in babies is cow’s milk protein allergy (CMPA).

Research and clinical guidelines are clear: allergy should be considered and ruled out — particularly in babies who don’t respond to standard reflux management, who have other symptoms like eczema, blood in nappies, or colic, or who have a family history of atopy.

If allergy hasn’t been formally investigated, it should be your first port of call with a paediatrician or specialist dietitian. Treating reflux without addressing an underlying trigger is like mopping the floor with the tap still running.

If you’re breastfeeding

Your milk is made from your blood, which means what you eat influences the proteins your baby is exposed to. If your baby has CMPA, the cow’s milk proteins you consume — dairy in all forms, including butter, cheese, yoghurt, hidden milk in processed foods — pass through into your milk in small but significant amounts. For a sensitised baby, that’s enough to trigger symptoms including reflux.

The first step, under guidance from a dietitian, is a maternal dairy elimination trial, typically four to six weeks, to see whether removing dairy from your own diet reduces your baby’s symptoms. This should always be done with support, because cutting dairy without a proper plan puts your nutritional status at risk, particularly for calcium and vitamin D.

If you’re breastfeeding and your baby has reflux, don’t let anyone tell you your diet is irrelevant. It isn’t.

If you’re formula feeding

This is where the type of milk really matters. Standard formula contains intact cow’s milk protein and for a baby with CMPA, this is likely the primary trigger.

There are two main types of specialist formula used for CMPA:

Extensively hydrolysed formula (eHF) — the protein has been broken down into smaller fragments. Most babies with CMPA tolerate this well and it’s usually the first-line recommendation. Brands available in the UK include Nutramigen, Aptamil Pepti, and SMA Althera, available on prescription.

Amino acid formula (AAF) — the protein is broken down completely into its building blocks. This is used when babies don’t tolerate eHF, or in more severe presentations. Brands include Neocate, Nutramigen Puramino, and Alfamino.

What about “comfort” or “anti-reflux” formulas from the supermarket? These are not the same thing. They are designed to thicken feeds and may slow regurgitation, but they do not address an allergic trigger. If allergy is the cause of your baby’s reflux, a comfort formula will not help in any meaningful way.

If you think formula type could be a factor, speak to your GP about a trial of a hydrolysed formula — and push for a dietitian referral if the standard advice isn’t working.

Reason 2: The food combinations matter more than you think

This is the one that surprises parents the most and the one I see missed constantly.

Let me give you a real example. A baby I’ve been working with recently was eating:

• Courgette and lamb with a side of pear purée

• Green beans with chicken

• Fruit as a snack

On the surface? Looks healthy. Varied. Fresh. Exactly what the books tell you.

But look at what’s missing: starchy carbohydrate. Every single time.

Here’s the science behind why that matters.

When a baby eats protein (like lamb or chicken) or acidic foods (like pear or green beans), the stomach has to produce significant acid to break them down. Gastric acid secretion is triggered by the presence of protein — specifically, the release of gastrin and the stomach works hard and fast in response.

Now add in a lower oesophageal sphincter that is still immature (totally normal at six months) and you have acid being produced in volume, with a valve that isn’t always doing its job properly.

Starchy carbohydrates act as a buffer. They are digested higher up in the GI tract, starting in the mouth with salivary amylase, and they slow gastric emptying in a way that regulates the acid response. They essentially calm the stomach environment down, which means less pressure building, less acid surging upward, and less reflux.

Without starch on the plate, the stomach is essentially left to manage protein and acid foods with nothing to moderate it.

Fruit as a snack on its own? Same problem. Natural sugars ferment quickly in the gut, produce gas, and increase intra-abdominal pressure, the last thing you want when there’s a reflux issue.

Reason 3: Starting the day with starchy carbohydrate is one of the most powerful things you can do

This is where breakfast becomes clinical.

A generous bowl of millet porridge, buckwheat porridge, or oats first thing does three things:

1. Buffers the empty stomach — after a night of milk feeds, the stomach is primed for a strong acid response. Starch first helps modulate that.

2. Sets up the digestive environment for the meals that follow — when the gut lining has had a gentle start, it handles more complex foods at lunch and dinner better.

3. Reduces fermentation pressure — these wholegrain starches feed gut bacteria in a way that produces short-chain fatty acids, which support gut lining integrity and motility.

Oats are brilliant if tolerated. Millet and buckwheat are worth exploring if there are any concerns about oat cross-reactivity (relevant in wheat-allergic or highly sensitised babies). All three are iron-containing, filling, and gentle.

What we changed — and what happened

For the family I mentioned above, we restructured every meal to include starchy carbohydrate as the base, not an afterthought.

• Breakfast: buckwheat porridge with a small amount of fruit stirred through

• Lunch: millet with vegetables and a small amount of protein

• Snacks: oatcakes, banana, rice cakes (not fruit alone)

The difference in reflux symptoms within two weeks was significant.

The takeaway

If your baby has reflux that isn’t resolving, ask yourself:

• Has allergy been properly ruled out?

• Is there a starchy carbohydrate at every meal and snack?

• Are the first foods of the day gentle and starch-led?

These aren’t small tweaks. In clinical practice, I see them make the difference between a baby who is still struggling at nine months and one who turns a corner.

If you want support working through this properly, with a structured plan and someone in your corner then The Food Allergy Baby Circle™ is where we do exactly that. Come join my online community and get help as soon as you enter the room.