You open the freezer, grab a bag, give it a thaw — and suddenly your baby is pulling faces you've never seen before. If your frozen milk smells or tastes soapy, you're not alone, and you definitely haven't done anything wrong.

It's Not Spoiled — It's Lipase

A soapy or metallic smell in thawed breast milk is almost always down to lipase activity breaking down fats during storage. It can happen even when milk has been stored perfectly according to all the guidelines — it simply comes down to the natural enzyme levels in your individual milk.

Is It Still Safe to Use?

Yes — the nutritional value and safety of the milk aren't affected, it's purely a taste and smell change. That said, plenty of babies will refuse milk that tastes different, which can leave mums with a freezer full of milk nobody wants to drink.

What Are Your Options?

Going forward, some mums try scalding milk before freezing to slow lipase activity. For milk that's already affected, freeze-drying is worth exploring — the process deactivates lipase and many mums report their baby happily accepts the resulting powder, even when they wouldn't touch the frozen version.

Don't let a freezer full of soapy-smelling milk go to waste. Find out how our Freeze-Drying Service can help, and read more in our FAQ.