TL;DR: Expired breast milk is not always safe for feeding, but it can still have meaningful non-feeding uses when it has been stored properly and does not appear spoiled. The safest choice starts with checking storage timelines, smell, texture, and your comfort level.

• Breast milk is usually considered expired when it passes recommended room temperature, refrigerator, or freezer storage windows.
• Spoiled breast milk may smell sour or rancid, though normal separation and high lipase changes do not always mean spoilage.
• Frozen breast milk is best used within about six months, though up to 12 months may be acceptable.
• Expired milk that is not spoiled may be used for milk baths, memory keepsakes, or breast milk jewelry.
• When milk smells off, was stored improperly, or feels questionable, discarding it is the safest choice.

---

Finding a bag of expired breast milk can bring up a lot of feelings. You may feel frustrated because pumping took time and energy. You may even feel sentimental because every ounce represents a season of motherhood.

If you are wondering what to do with expired breast milk, start by figuring out whether the milk is past the recommended storage window or truly spoiled. Expired milk is not always safe for feeding, but there are several other uses for it. Continue reading to learn about the little ways that your milk can still hold meaning, even after it can no longer be used how you originally planned.

How Do You Know If Breast Milk Is Expired?

Breast milk is usually considered expired when it has passed the recommended storage guidelines. Expired milk won’t always look or smell different. Sometimes, the only clue is the date on the bag.

According to the CDC, freshly expressed or pumped milk can be stored:

• At room temperature for up to four hours
• In the refrigerator for up to four days
• In the freezer for about six months for the best quality

It’s acceptable to keep breastmilk frozen for up to 12 months, but the quality might degrade during that time. Thawed milk should be used within 24 hours if kept in the refrigerator. Once you’ve warmed the milk or brought it to room temperature, it should be used within two hours.

If milk is outside those windows, do not feed it to your baby unless your pediatrician or a trusted lactation professional tells you otherwise.

How Do You Know If Breast Milk Is Spoiled?

The first sign that breast milk is spoiled is usually the smell. Spoiled breast milk may smell sour, rancid, or generally unpleasant. With that said, a soapy or metallic smell can sometimes happen because of high lipase activity, which is different from spoilage. If you’re on the fence, you may choose to taste a little bit to confirm.

Milk that has chunky clumps that do not mix back together may also be questionable. It’s normal, however, for breastmilk to separate in storage. The fat can rise to the top and leave thinner milk underneath. That separation alone doesn’t mean the milk is spoiled or unsafe to drink.

If you are unsure whether milk is spoiled, choose safety and ask a trusted healthcare professional before feeding your baby.

Does Breastmilk Expire in the Freezer?

Yes, for feeding purposes, breastmilk does eventually expire in the freezer. Freezing helps preserve milk much longer than refrigeration, but it does not stay at its best quality forever.

The CDC recommends using frozen breast milk within about six months for best quality, though up to 12 months is considered acceptable. The CDC also recommends labeling milk with the date it was expressed and storing it toward the back of the freezer rather than in the door, where temperature changes happen more often.

If you find frozen milk that is past the recommended window, it may no longer be the right choice for feeding. That can feel disappointing, especially if you worked hard to build a freezer stash. Still, there may be other ways to use your expired frozen breast milk, assuming it does not smell spoiled.

What to Do with Expired Breast Milk

Milk that is slightly past a recommended window but has been frozen or refrigerated properly is different from milk that sat out too long or thawed unexpectedly. If milk was stored incorrectly or has a sour smell, it is okay, and even wise, to let it go.

If the milk has expired but is not spoiled, some parents consider non-feeding uses. You can even choose to preserve your milk as a special keepsake. Even the smallest amount of milk can represent a meaningful feeding or parenting journey, even after it is no longer usable in a bottle.

When to Throw Expired Breast Milk Away

Sometimes, the best option is to throw expired breast milk away. That can feel emotional, but it may be the safest choice for your baby.

Discard breast milk if:

• It smells sour, rotten, or rancid.
• It was stored outside safe temperature guidelines.
• It was left out too long after thawing or warming.
• Your baby drank from the bottle, and the leftover milk is past the safe window.
• The container was not sealed or may have been contaminated.
• You feel unsure and cannot confirm whether it is safe.

Letting milk go means you are making a careful, safe choice for your baby.

Uses for Expired Breast Milk Beyond Feeding

There are several uses for expired breast milk that do not involve feeding, as long as the milk does not smell spoiled and you feel comfortable using it.

A few options to consider include:

• Milk baths: Some parents add breast milk to bathwater for sentimental or gentle skincare reasons, as long as the milk is not spoiled and baby’s skin is healthy.
• Breast milk jewelry: Expired milk can often be preserved into a custom ring, necklace, bracelet, or other keepsake.
• Memory keepsakes: Some parents save milk as part of a shadow box, memory box, or other personal remembrance.
• External use with caution: Some families use breast milk on skin, but avoid using expired milk on broken, irritated, infected, or highly sensitive skin unless a pediatrician says it is okay.
• Compost or discard: If the milk smells bad or feels questionable, throwing it away may be the safest choice.

It can be hard to discard milk you worked hard to pump. Know that choosing safety doesn’t erase that effort.

How To Use Expired Breastmilk for a Bath

If the milk is expired by date but does not smell unpleasant, some parents choose to add it to bathwater. This is a non-feeding use, so the safety concern is different from putting it in a bottle.

Still, your baby’s skin matters. Follow these guidelines to ensure safety:

• Do not use spoiled breast milk in a bath
• Avoid using expired milk if your baby has open skin, an active rash, signs of infection, or known sensitivities unless your pediatrician gives you guidance
• If your baby’s skin seems irritated after a milk bath, stop using it

Remember that a milk bath can be beneficial for some babies, but it is always optional. Please never feel like it’s something you have to do to avoid wasting milk.

Turning Expired Breast Milk Into Something Meaningful

Even when breastmilk is no longer safe for feeding, it can still hold the story of what you accomplished with your body. For some moms, breast milk jewelry can turn a small amount of milk into something lasting. A ring, necklace, bracelet, or custom piece can hold the memory in a form you can wear close.

Even if your breast milk has expired, it can still be beautifully preserved. Transform it into a meaningful piece of breast milk jewelry today.