When it comes to breast pumping and storing milk, one of the most common questions new moms have is how long you can keep pump parts in the fridge between uses before you need to wash them. There are a few factors to consider when determining the answer.
Quick Answer
The quick answer is that most experts recommend washing pump parts after each use. However, it is generally safe to store cleaned and air dried pump parts in the refrigerator for up to 24 hours between uses before washing again.
Overview of Pumping and Storing Milk
When pumping breast milk, the goal is to express milk safely and store it until baby is ready to eat while preserving as much of the nutritional and immunological properties as possible. To do this, proper cleaning and sanitation of pump parts, bottles, and storage containers is crucial.
Here are some general guidelines for pumping and storing breast milk:
- Before first use, wash all pump parts in hot, soapy water or put them on the top rack of the dishwasher.
- Pump parts that come into contact with milk (flanges, valves, membranes) should be washed after each use.
- Rinse pump parts in cold water to remove residual milk after pumping.
- Store rinsed pump parts in a clean, sealed container in the refrigerator between uses.
- Milk can be stored in cleaned containers or milk storage bags in the refrigerator for up to 4 days.
- For long-term freezer storage, milk can be kept for 6-12 months in an air-tight container.
- Avoid re-freezing breast milk after it has thawed.
Reasons to Wash Pump Parts After Each Use
Here are some of the main reasons it is recommended to fully wash pumping equipment after each use:
- Prevent bacterial growth – Milk residue left on pump parts can promote rapid bacteria growth.
- Avoid contamination – Not washing could introduce new bacteria into freshly pumped milk.
- Ensure clean extraction – Washing removes built-up lipids that could impede pumping performance.
- Monitor for normal wear – Frequent washing allows you to inspect pump parts for damage.
- Follow manufacturer guidelines – Most pump manufacturers direct users to wash after each use.
Why You May Want to Refrigerate Between Pumps
There are a few reasons why some moms may want or need to store pump parts in the fridge between pumping sessions rather than wash each time:
- To save time when pumping frequently or exclusively throughout the day
- To avoid excess washing that could lead to wear and tear on pump parts
- If there is limited access to a sink for washing, such as at work
- If a mom is feeling lazy and skips a full wash but wants to keep parts cold
Factors that Impact Refrigerated Storage Time
If you do choose to store used pump parts in the refrigerator between pumps, here are some factors to keep in mind that can impact how long they are safe:
- Condition of pump parts – Well-used and worn parts are more susceptible to bacterial growth than newer parts.
- Frequency of use – Parts used multiple times per day need more frequent washes than single daily use.
- Rinsing technique – Thoroughly rinsing all surfaces reduces milk residue that bacteria thrive on.
- Refrigerator temperature – Colder fridges below 40°F inhibit bacterial growth more than warmer units.
- Length of time – Bacteria multiply faster the longer parts have been stored.
General Storage Time Recommendations
Given all of these factors, the general recommendations from breast pump manufacturers, the CDC, and lactation consultants on maximum refrigerator storage times for pump parts are:
| Storage Time | Recommendation |
|---|---|
| After each use | Wash thoroughly with soap and hot water |
| 6-8 hours | Safe with proper refrigeration if rinsed |
| 24 hours | Maximum time before washing again |
| Over 24 hours | Not recommended – high risk of bacteria |
However, take note that these are general guidelines only. It is always best practice to wash pump parts after each use whenever possible.
Steps for Refrigerated Storage
If you do opt to store pump parts in the refrigerator, be sure to follow these steps:
- Take pump parts apart fully so all surfaces are exposed.
- Rinse thoroughly under cool running water.
- Shake off or air dry excess moisture.
- Seal parts in a clean storage bag or container.
- Store in the refrigerator – not the door where temperature varies.
- Use within 24 hours and no more than 3-4 times between washes.
- Inspect parts prior to next use for milk residue or condensation.
- Wash all parts at least once every 24 hours.
Signs It’s Time to Wash
Even when practicing proper refrigerated storage methods, make sure to fully wash pump parts if you notice any of the following:
- Visible milk residue remaining on parts
- Water or condensation buildup in storage container
- Warping, cracking, or discoloration of parts
- Pump suction is weak
- Rancid or sour odor
- Mold visible on parts
- 24 hours has passed
Storing Milk Between Pumps
Keep in mind refrigeration recommendations are for pump parts only – not breast milk itself. Expressed milk can be stored as follows:
- Countertop – Up to 4 hours (ideal to refrigerate sooner)
- Refrigerator – Up to 4 days
- Freezer – 6 to 12 months depending on type
Maintaining Safe Pumping Hygiene
To keep your pumping process as sanitary as possible:
- Always wash hands thoroughly before handling pump or bottles
- Follow manufacturer instructions for cleaning all pump parts
- Use dedicated pump parts – don’t mix with bottle feeding equipment
- Replace worn pump membranes or valves
- Freeze milk in small batches to limit contamination
- Label and date milk storage containers
- Use oldest refrigerated milk first
Best Practices
While it may be safe in some circumstances to store used pump parts in the refrigerator for up to 24 hours, it is always recommended to wash all parts after every use.
The risks of bacterial growth, milk contamination, and reduced pump effectiveness increase the longer used parts are stored. Following pump manufacturer guidelines for cleaning is the best way to ensure milk remains safe for your baby while optimizing your pumping regimen.
The Bottom Line
Here is a quick summary of recommendations on storing pump parts:
- Wash all parts after each use for optimal hygiene and safety
- Rinse parts thoroughly if refrigerating between pumps
- Use refrigerator storage for no more than 24 hours
- Inspect carefully before reusing for any moisture or residue
- Replace parts as needed if they become cracked, warped or discolored
While 24 hours is the upper limit for refrigeration, aim for the shortest storage time possible, especially if pumping frequently. And remember, breast milk itself can be stored safely in the refrigerator for up to 4 days – storing pump parts is just temporary between pumping sessions.
Conclusion
Properly storing breast pump parts between uses helps ensure you pump high quality milk for your baby safely and comfortably. While washing after each individual use is always recommended, pump parts can generally be refrigerated for up to 24 hours between washes if properly rinsed and stored. Pay close attention for any signs of residue, odor or damage and replace parts regularly. Follow manufacturer cleaning guidelines and remember refrigeration is short-term only. Prioritize frequent, thorough washing and inspection of all pump parts to optimize pumping success.
