High Lipase Breastmilk: What It Is and Why Freeze-Drying Often Helps

We receive quite a few enquiries from mummies who've discovered a problem with their frozen stash: they thaw a bag, their baby refuses it completely, and when they smell the milk, it's soapy. Sometimes metallic. Definitely not right.

If this sounds familiar, you're dealing with high lipase activity — and you're not alone. It comes up regularly in Singapore's breastfeeding communities, and it's one of the reasons some mummies find their way to us.

What lipase actually is

Lipase is an enzyme naturally present in breastmilk. Its purpose is beneficial: it helps break down fats so your baby can digest them more easily. In most mummies, this process is slow and doesn't noticeably affect stored milk. But in some mummies, lipase is particularly active — it keeps breaking down fats even after the milk is expressed and stored. The breakdown products are what create that soapy, rancid, or metallic taste.

The milk is not spoiled. It's not unsafe. But many babies refuse it because the flavour is so different from what they're used to.

The usual fix — and its trade-offs

The conventional recommendation is scalding — heating freshly expressed milk to around 82°C just before boiling, then cooling it quickly before storing. This deactivates the lipase enzyme before it can cause significant breakdown.

It works. But it adds a step to every single pumping session, every day, indefinitely. And some research suggests that scalding at high temperatures may reduce certain heat-sensitive bioactive components of breastmilk. It's a trade-off worth knowing about.

How freeze-drying interacts with high lipase

Several of our mummies with confirmed high lipase have reported that freeze-dried milk is accepted by their babies without the soapy taste issue — without needing to scald first.

The reason makes sense scientifically. Lipase needs water to continue its enzymatic activity. When we remove approximately 90% of the water content during freeze-drying, the lipase enzyme's action is effectively arrested. In the dry powder form, fats aren't continuing to break down during storage.

We want to be clear: freeze-drying is not a guaranteed fix for every high lipase situation, and individual results vary. If your baby has a feeding or taste preference issue, we always recommend discussing with your lactation consultant or paediatrician. But for mummies who are already considering our service and dealing with high lipase on top of everything else — it's a meaningful additional benefit worth knowing about.

If you suspect high lipase

A simple test: compare the smell and taste of freshly expressed milk against a bag that's been frozen for three to four weeks. A significant difference in smell or taste — soapy, metallic, or rancid — is a strong indicator of high lipase activity.

From there, we're happy to discuss whether our service makes sense for your situation. WhatsApp us at +65 8802 1996.

Frequently Asked Questions (FAQ)

Is high lipase breastmilk spoiled?

No. High lipase milk is usually still safe if stored properly.

Can babies drink high lipase breastmilk?

Yes, many babies can. However, some babies may dislike the altered taste after freezing.

Can freeze drying preserve breastmilk nutrients?

Low-temperature freeze drying is designed to preserve sensitive components better than high-heat drying methods.

Does all frozen milk become high lipase?

No. Lipase activity varies between mothers.