A2 or Goat Milk Formula — What’s the Difference? (Australian Guide)

You’ve done the research. You know standard cow’s milk formula might not be working for your baby. You’ve landed on two options that keep coming up: A2 formula and goat milk formula.

And now you’re trying to figure out which one is actually better — and what the difference even is, because nobody explains it clearly.

Here’s the short version: **goat milk is already A2.** So the choice isn’t really A2 versus goat milk. It’s A2 cow milk versus A2 goat milk — and those two things are not the same.

Let’s unpack it properly.

What is A2 protein, and why does it matter?

Milk contains protein. Most of the protein in milk is casein, and within casein there are different types. The one that matters here is beta-casein — specifically, whether it’s A1 or A2.

Most standard cow’s milk contains a mix of A1 and A2 beta-casein. A1 is the dominant type in modern dairy herds. When A1 beta-casein is digested, it releases a peptide called BCM-7 (beta-casomorphin-7), which some research links to digestive discomfort, inflammation, and gut irritation in sensitive individuals.

A2 beta-casein doesn’t produce BCM-7 during digestion. It behaves more like the proteins in human breast milk — gentler, easier to process, less likely to cause gut disruption.

That’s why A2 matters for babies with sensitive tummies. And that’s why “A2 formula” became a category.

What is A2 cow milk formula?

A2 cow milk formula is made from cows selectively bred (or screened) to produce only A2 beta-casein. No A1. The result is a cow’s milk formula with the gentler protein profile of goat milk — without the taste, smell, or other compositional differences of goat milk.

Brands like a2 Platinum market this specifically. The pitch is: same gentleness as goat milk, more familiar base.

It’s a legitimate product. For babies who are sensitive to A1 protein specifically — and for parents who’ve found goat milk too strong in taste or smell — A2 cow milk formula can be a good option.

But it’s not the same as goat milk formula. And this is where most comparisons stop being useful.

The thing most comparison guides don’t tell you

**Goat milk is naturally A2.**

It has been since before anyone invented the category. Goats don’t produce A1 beta-casein. Their milk contains only A2 — which is part of why it’s been used for generations as an alternative for people who struggle with standard cow’s milk.

So when you choose goat milk formula, you’re getting A2 protein automatically. What you’re also getting — and what A2 cow milk formula doesn’t give you — is everything else that makes goat milk different from cow milk.

Goat milk vs A2 cow milk: the full comparison

The A2 protein benefit is the same in both. But goat milk formula delivers it alongside a broader set of digestive advantages that A2 cow milk doesn’t.

Oligosaccharides — the difference that matters most for gut health

This is the big one. Goat milk naturally contains around 6× more oligosaccharides than cow milk — A1 or A2.

Oligosaccharides are prebiotics. They feed the beneficial bacteria in your baby’s gut, support immune function, and help regulate digestion. The more diverse and abundant the prebiotic environment, the calmer and more settled the gut.

Fourteen naturally occurring oligosaccharides have been identified in goat milk. Five of those are also found in human breast milk. That’s not a coincidence — it’s part of why goat milk is often described as the closest mammalian milk to human milk in compositional terms.

An RMIT University study, published in the *British Journal of Nutrition*, confirmed that Oli6 goat milk formula stimulates significant growth of bifidobacteria — the beneficial bacteria associated with settled, healthy infant digestion. The oligosaccharide profile is a key reason why.

A2 cow milk formula doesn’t have this. The protein type changes, but the oligosaccharide content stays close to standard cow milk levels.

Fat structure — soft curds vs firm curds

Goat milk fat globules are smaller than cow milk fat globules — A1 or A2. Smaller globules form softer, looser curds in the stomach. The gut processes them faster and with less effort.

Less digestive effort = less gas trapped = less discomfort.

This is separate from the protein benefit. A2 cow milk formula changes the protein structure; it doesn’t change the fat globule size.

So when would you choose A2 cow milk formula instead?

Be honest about this — A2 cow milk formula has its place.

Choose A2 cow milk formula if:

– Your baby has tried goat milk formula and doesn’t tolerate the taste

– Your baby shows no significant digestive symptoms — you’re just being cautious about A1

– You’re transitioning from standard cow milk and want the smallest possible change

– Goat milk formula isn’t available at your local chemist or supermarket

Choose goat milk formula if:

– Your baby has consistent digestive symptoms: wind, bloating, unsettled behaviour after feeds, difficult stools

– You want the full package — A2 protein plus oligosaccharides plus smaller fat globules

– You’ve already tried standard cow milk formula and it’s clearly not working

– You want a formula with more published research behind its gut health claims

What about allergies? (Important distinction)

Neither A2 cow milk formula nor goat milk formula is appropriate for babies with a true cow’s milk protein allergy (CMPA).

CMPA is an immune response to milk proteins. Because goat milk proteins are structurally similar to cow milk proteins, many babies with CMPA will react to goat milk too. A2 cow milk formula is still cow milk — same proteins, just different beta-casein type.

Both are different from cow’s milk protein intolerance (CMPI), which is a digestive sensitivity rather than an immune response. CMPI babies often tolerate goat milk formula well. True allergy babies typically need a hydrolysed or amino acid formula.

If you’re not sure which your baby has, that’s a GP conversation — not a formula swap.

The Oli6 difference: A2 + everything else

Every tin of Oli6 is naturally A2. That’s not a marketing claim — it’s just what goat milk is.

But it also contains SynbiOli™, our signature gut-support blend — including BB536, the clinically researched probiotic that Oli6 was the first formula brand in Australia to use. Combined with the natural oligosaccharides already in goat milk, that’s a prebiotic and probiotic combination that A2 cow milk formula doesn’t offer.

4.9 stars from 380+ reviews on ProductReview.com.au. Australia’s most-reviewed infant formula, five years running. The reviews tell you what the ingredients promise.

Shop Oli6 → — available at Coles, Woolworths, Chemist Warehouse, and 2,500+ stockists. Subscribe & Save takes 7.5% off every order.

FAQ

Is goat milk formula naturally A2?

Yes. Goat milk is naturally A2 — it contains only A2 beta-casein protein, with no A1. This is the same protein type found in human breast milk. So goat milk formula gives you the A2 benefit automatically, alongside goat milk’s other digestive advantages.

What is the difference between A2 formula and goat milk formula?

A2 formula is cow’s milk formula made from cows that produce only A2 beta-casein. Goat milk formula is made from goat milk, which is naturally A2. The key differences beyond protein type: goat milk contains significantly more natural oligosaccharides (prebiotics), smaller fat globules for easier digestion, and a different mineral profile with more calcium, magnesium, and vitamin C compared to cow milk.

Is A2 formula the same as goat milk formula?

No — they achieve the A2 protein benefit differently. A2 cow milk formula is made by selecting cows that only produce A2 beta-casein. Goat milk formula uses goat milk, which is naturally A2. But goat milk formula also has additional advantages that A2 cow milk doesn’t: more natural oligosaccharides, smaller fat globules, and a closer nutritional resemblance to human breast milk.

Which is better for a sensitive tummy — A2 or goat milk formula?

Both can be gentler than standard cow milk formula because both use A2 protein. But goat milk formula has additional digestive advantages: ~6× more natural oligosaccharides (prebiotics) than cow milk, and smaller fat globules that form softer curds. For babies with sensitive tummies, goat milk formula offers more digestive support overall.

Can babies allergic to cow milk have goat milk formula?

Not necessarily. Goat milk proteins are similar enough to cow milk proteins that babies with a true cow’s milk protein allergy (CMPA) may react to goat milk formula too. This is different from cow’s milk protein intolerance (CMPI), where the reaction is less severe and some babies do tolerate goat milk. Always consult your GP or paediatric allergist before switching if a true allergy is suspected.

The A2 question has a simpler answer than the formula industry makes it look. Goat milk is already A2. It always has been. The question is whether you also want the oligosaccharides, the smaller fat globules, and the RMIT-backed gut health research that comes with it.

For most families with sensitive tummies — you do.

**Keep reading:**

– Goat Milk Formula for Colic →

– How to Switch to Goat Milk Formula →

– The RMIT Study →

– The Goat Truth →

NOTES

*For mums who are able to, breastfeeding is best. We’ll always say that.*