Is it bad if breast milk smells sour?

Understanding Sour-Smelling Breast Milk: Is It a Cause for Concern?
Breast milk is often referred to as “liquid gold” for its nutritional benefits and unique properties. However, many breastfeeding mothers may encounter a situation where their expressed milk develops a sour smell. This phenomenon can be concerning, leading to questions about the safety and quality of the milk.
What Causes Sour Smells in Breast Milk?
The sour smell in breast milk can arise from several factors, and not all of them indicate spoilage. One common reason is the presence of lipase, an enzyme naturally found in breast milk that helps break down fats. While lipase is beneficial, some mothers may notice that their milk develops a soapy or sour odor after being frozen and thawed. This change is generally considered normal and is linked to the activity of lipase, which can become more pronounced over time, especially in stored milk.
Another important aspect to consider is the storage conditions of the milk. Breast milk can spoil just like any other type of milk, leading to a sharp, sour smell that indicates it is no longer safe for consumption. Spoiled milk should be discarded, as there is no way to salvage it. Therefore, if the sour smell is accompanied by a rancid taste or if the milk has been stored beyond recommended time frames, it is crucial to err on the side of caution and dispose of it.
When Is Sour Smell Normal?
For many mothers, a slightly sour or soapy smell does not necessarily mean the milk is bad. In fact, some mothers report that their milk smells sour or soapy after refrigeration or thawing, even when proper storage guidelines are followed. This is often due to the natural enzymatic activity of lipase, which can intensify the longer the milk is stored.
If the milk smells sour but does not taste rancid, it may still be safe for the baby. Many mothers choose to use the milk despite the odor, as it retains its nutritional value. However, it is always advisable to taste a small amount to ensure it is not spoiled.
Conclusion: Trust Your Senses
In summary, while a sour smell in breast milk can be alarming, it is not always a sign of spoilage. The presence of lipase and the effects of storage can lead to changes in odor that are perfectly normal. However, if the milk has a distinctly rancid smell or taste, it is best to discard it. Mothers should trust their senses and, when in doubt, consult with a healthcare professional to ensure the safety of their milk for their baby.

How to tell if milk is spoiled?

Regardless of the printed date, the best way to determine whether milk is spoiled is with a simple sniff test. Spoiled foods develop an off odor, flavor or texture due to naturally occurring spoilage bacteria. If milk exhibits any characteristics of spoilage, it should be thrown out.

What happens if my baby drinks sour breast milk?

If your baby has had spoiled breast milk, they’ll likely let you know. They may throw up, or have an upset stomach, diarrhea or fever. It’s important to call your pediatrician if you think your baby may be sick from having spoiled breast milk.

Why does my breast milk smell funny in the fridge?

Some mums notice that their expressed milk has an ‘off’ or soapy smell and taste, even when they have handled it cleanly. This can be caused by oxidation following the normal action of enzymes in the milk designed to help the baby digest the milk fats.

What causes sour breast milk?

The true cause of the sour smell and taste isn’t necessarily the amount of lipase in your milk, but the rate of lipase activity. While some moms can store milk in the refrigerator or freezer for a while with no change in smell, others notice a change after just 24 hours.

How to know if breastmilk is spoiled?

It will also smell bad, much like spoiled cow’s milk. And, like spoiled cow’s milk, breast milk that’s old will taste sour. (It’s fine to taste your breast milk to check!) Always label your pumped milk with a time and date so you can tell how old it is.

Why does my breastmilk smell sour?

Your milk may have excess lipase in it, which can cause stored breastmilk to smell sour or soapy. Lipase is a beneficial enzyme found in breast milk that helps break down milk fat. If your breastmilk has excess lipase, the longer the milk is stored, the stronger the smell becomes.

Can breast milk become sour in the breast?

No, breast milk doesn’t spoil inside the breast. It’s produced on demand and maintains its freshness. However, once expressed, it can spoil if not stored properly.

Is sour breast milk safe?

Human milk that has truly soured has a very distinct sour taste and odor – much like soured cow’s milk. If your milk doesn’t smell distinctly sour or rancid, then it should be safe to give to your baby.

Is it OK if milk smells a little sour?

Smell: If milk has a bad smell, it may indicate spoilage. Fresh milk should have a mild, pleasant aroma. A sour or off smell usually means that bacteria have started to grow, and it’s best not to consume it.

Is sour milk safe for babies?

Over time, you get more lactic acid than lactose and the milk sours. Since infant stomach lining is thinner and less developed than older humans, the acid can burn and cause reflux issues, leading to vomiting, and sometimes even milk aversion.