Breast Milk Smells Like Eggs? (Here's Why)
Noticing a strange smell in your breast milk can catch you off guard, especially when it’s something unexpected like an eggy or sulfur-like scent.
A lot of parents notice this at some point, and the first reaction is usually, “Wait… is this bad?”
The good news is that this is actually a pretty common concern, and in many cases, it’s completely normal.
The smell, the taste, and even appearance of breast milk can change depending on things like your diet, how the milk is stored, and natural enzymes in your body.
In this post, I’ll explain why your breast milk smells like eggs and what it usually means.
#1 High Lipase Activity
This is the most common reason why your breast milk smells like eggs.
If your milk smells a bit like eggs, soap, or even metal after being stored, high lipase activity is usually behind it.
Lipase is an enzyme naturally found in breast milk. Its job is actually helpful: it breaks down fats so your baby can digest the milk more easily.
Sounds great, right? It is… until it goes a little overboard.
When there’s a higher level of lipase, the fat in the milk starts breaking down faster than usual. That process can change the smell and taste over time, especially after refrigeration or freezing.
That’s when you might notice that weird egg-like scent.
The important part? This doesn’t mean the milk is spoiled. It’s still safe in most cases.
Some babies drink it without any issue, while others suddenly act like you just offered them something very suspicious.
Also Read: Baby’s Poop Smell Like Vinegar
#2 Diet
Yep, what you eat can sneak its way into your breast milk, and sometimes, into its smell too.
Certain foods are known for giving breast milk a stronger or slightly sulfur-like odor. And guess what sulfur smells like? Eggs.
Some common foods that can affect the smell include:
Eggs
Garlic
Onions
Broccoli, cabbage, and similar veggies
Other sulfur-rich foods
Now, before you start cutting everything out of your diet, take a breath. This kind of smell change is usually temporary and not harmful at all. In fact, exposing babies to different flavors early on can be a good thing.
So unless your baby is refusing feeds consistently right after you eat certain foods, there’s usually no need to change what you’re eating.
#3 Storage Changes
Storage can also make your breast milk smell like eggs.
Breast milk is pretty sensitive, and even when stored properly, it can change over time. When milk sits in the fridge or freezer, a couple of things can happen. Fats can start to break down, and oxidation can kick in.
Both of these can slightly alter the smell.
A few small details can make a difference here, like how quickly the milk was cooled, how long it stayed in storage, and how it was thawed.
Also Read: Baby’s Breath Smell Like Fish
Here are some good storage habits that can help reduce smell changes:
Cool milk as soon as possible after pumping
Use airtight containers
Avoid repeatedly warming and cooling the same milk
Stick to recommended storage times
Even with all that, some smell change is still normal. Breast milk isn’t processed like formula, so it behaves more like a fresh food than a shelf-stable product.
#4 Health-Related Causes (Less Common)
Most of the time, the smell has nothing to do with your health. But in a few cases, it can be linked to something going on in your body.
Conditions like Mastitis or blocked ducts can sometimes affect the smell of breast milk. These situations usually don’t show up quietly, though. Your body tends to give you pretty clear signals.
Watch for things like:
Breast pain or tenderness
Redness or warmth in one area
Fever or chills
Feeling run down or flu-like
If you’re dealing with any of these along with a noticeable smell change, it’s worth getting checked out. Otherwise, smell alone isn’t a strong indicator of a health issue.
Is Egg-Smelling Breast Milk Safe?
Yes, breast milk that smells like eggs is safe most of the time.
A mild egg-like scent is often due to normal changes in stored milk, not spoilage. If the milk was stored properly and your baby drinks it without fuss, it’s usually safe.
High lipase levels can cause a slightly eggy or soapy smell, and that’s still fine for most babies.
That said, a strong, foul, or rotten smell is a red flag.
Fresh breast milk rarely smells bad, so if it does (or if it’s been stored too long or left out) go ahead and discard it.
When in doubt, trust your instincts and don’t use it.
What You Can Do About It
If the smell is bothering you (or your baby is rejecting the milk) you’ve got a few options to try.
First, figure out when the smell appears. Is it only after storage? Right after pumping? After certain meals? That helps narrow down the cause.
Then you can experiment a bit:
Use fresher milk when possible instead of long-stored milk
Store in smaller portions to reduce repeated warming
Chill milk quickly after pumping
Try mixing fresh milk with stored milk to balance the taste
If high lipase is the main issue, some parents choose to scald the milk before storing it. That process involves gently heating the milk to deactivate the enzyme. It can help prevent the smell from developing later.
Also Read: Is Frozen Colostrum Good For A Sick Baby?
It does take a bit of extra effort, though, and it’s not always necessary unless your baby is refusing stored milk consistently.
Diet adjustments are another option, but they’re usually the last thing to try. Cutting out foods just because of a mild smell change isn’t always worth it unless you see a clear pattern.
When To Seek Medical Advice
Most of the time, you can handle this at home without any stress. But there are a few situations where it’s better to check in with a professional.
Keep an eye out for:
Strong, rotten odor instead of a mild egg-like smell
Pain, swelling, or redness in the breast
Fever or feeling unwell
Baby refusing feeds repeatedly and consistently
Any unusual changes in milk appearance
If any of these show up, it’s a good idea to talk to a doctor or lactation consultant.
It’s always better to double-check than to sit there worrying.
Bottom Line
An egg-like smell in breast milk is usually nothing serious. In most cases, it comes down to lipase activity, diet, or simple storage changes and not spoilage.
If your baby is feeding well and you’re not dealing with any physical symptoms, you’re probably in the clear.
Breast milk can be a little unpredictable sometimes. Smell changes are just part of the deal. Once you know what’s causing it, it gets a lot less worrying, and a lot easier to manage.