High Lipase Breastmilk: What It Is and What You Can Do About It

What Is Lipase, and Why Does It Matter?

Lipase is a naturally occurring enzyme in breastmilk. Its job is to help your baby digest the fats in your milk — which is a good thing! However, some mothers produce breastmilk with higher-than-average lipase activity. When this milk is expressed and stored, the elevated lipase continues to break down fats even after pumping. This creates fatty acids that cause the milk to develop a distinct soapy, metallic, or even rancid smell and taste — even when it has been stored correctly in the freezer.

The milk is not spoiled. It is not unsafe. But many babies find the altered taste unappealing and will refuse to drink it.

How Do I Know If I Have High Lipase Breastmilk?

Here are the signs to look out for:

•       Your previously frozen breastmilk smells soapy, metallic, or sour after thawing

•       Your baby accepted fresh breastmilk happily but refuses stored milk

•       The change in smell or taste happens within a few hours of pumping, even in the fridge

The simplest test is to pump a small amount of milk, refrigerate it for 24 hours, then smell and taste it yourself. If it smells noticeably different from fresh milk, high lipase is likely.

Why Is This a Problem for Working Mummies?

For mothers who rely on a frozen stash — whether you're returning to work, travelling, or simply building a reserve — high lipase can be incredibly stressful. Imagine spending weeks building up a freezer full of breastmilk, only to find that your baby won't drink any of it. It is not just emotionally draining; it represents hundreds of hours of pumping going to waste.

In Singapore, where many mothers return to work within a few months of delivery, having a reliable stored milk supply is essential. High lipase disrupts that plan entirely.

Traditional Solutions and Their Limitations

Scalding Your Breastmilk

The most widely recommended remedy is scalding — heating your freshly pumped milk to around 70–82°C before storing it. This deactivates the lipase enzyme before it can alter the taste.

The downside? Scalding is time-consuming, especially for mothers who pump multiple times a day. It also adds another step to an already demanding routine, and some research suggests that heating can reduce certain heat-sensitive immune factors in breastmilk.

Mixing With Fresh Milk

Some mothers mix stored milk with freshly pumped milk to dilute the altered taste. This works in mild cases, but is not practical for all situations.

Trying Different Storage Methods

Glass vs plastic containers, different freezer temperatures, shorter storage times — mothers often experiment with all of these, usually with limited results.

How Freeze-Drying Addresses High Lipase Breastmilk

This is where freeze-drying offers a meaningful advantage. The freeze-drying process works at ultra-low temperatures and removes almost all moisture from the milk, halting biochemical activity — including lipase enzyme action.

At LyoBB, our proprietary BioA™ process preserves your breastmilk in a stable, powdered form. Because the moisture content is reduced by up to 99%, the lipase enzyme has no water medium to work in. The result is freeze-dried breastmilk powder that retains the taste and nutritional profile far closer to fresh milk.

Many mothers who previously struggled with high lipase have found that their babies accepted freeze-dried breastmilk powder without any issues — even babies who had consistently refused the frozen-and-thawed version.

Is It Safe?

Absolutely. LyoBB operates in an ISO 13485-certified facility in Singapore. ISO 13485 is a medical-grade quality management standard — the same certification used in pharmaceutical and medical device manufacturing. This means every batch of breastmilk we process is handled under strict hygiene and safety protocols, with full traceability from collection to return.

Our nutrient retention research, conducted in-house by our scientific team with backgrounds in lyophilisation (freeze-drying) from institutions like A*STAR, confirms that essential nutrients, IgA antibodies, and probiotics are preserved through the process.

Practical Tips for Mummies With High Lipase

• Test early: Don't wait until you have a full freezer stash. Test a small amount of stored milk at 24 and 48 hours after pumping.

• Talk to a lactation consultant: High lipase is a recognised condition — a professional can help confirm it and advise on your feeding plan.

• Consider freeze-drying as your primary storage method: Rather than building a frozen stash that may go to waste, send batches to LyoBB for freeze-drying as you go.

• Label everything: Whether fresh, scalded, frozen, or freeze-dried, clear labelling keeps feeding organised, especially when a caregiver or helper is involved.

The Bottom Line

High lipase breastmilk is frustrating, but it does not mean your breastfeeding journey has to end. With the right information and the right approach, you can continue to provide your baby with the unmatched nutrition of your breastmilk — even in stored form.

If you're dealing with high lipase and want to explore freeze-drying as a solution, our team at LyoBB is happy to help. We've worked with many Singapore mummies in exactly your situation.