What is the Fridge Hack?

To save time, some mothers will skip washing their breast pump parts with soap and water after each use. Instead, they may rinse away any remaining milk residue, place the parts in a clean, sealed bag or container, and store them in the refrigerator between pumping sessions. At the end of the day, they thoroughly wash and sanitize their parts before using them again.

Known as the "Fridge Hack," this approach has become popular because it can make frequent or exclusive pumping feel more manageable. Many mothers—especially those returning to work—may not have enough time to wash pump parts between sessions. While it may seem like a good idea, there are important health concerns and safety considerations to understand before deciding whether it's right for you.

Why Does Proper Pump Cleaning Matter?

Even small amounts of leftover milk can create an environment where bacteria multiply. Without proper cleaning, leftover milk can increase the risk of bacterial growth, which can contaminate your baby's milk—especially when pump parts are used multiple times throughout the day. Following CDC recommendations helps protect your baby's milk from contamination while supporting safe feeding.

Infants have become ill from contaminated milk due to bacterial growth on pump parts that were not cleaned properly. If your infant is younger than 2 months, was born prematurely, or has a compromised immune system, proper cleaning after each use—and sanitizing at least once daily—is especially important.

What Do Experts Recommend?

The U.S. Centers for Disease Control and Prevention (CDC) and most breast pump manufacturers recommend washing all parts that come in contact with your milk with soap and water after every pumping session. These recommendations are considered best practices for cleaning infant feeding items because they help remove leftover milk that can allow harmful germs to grow. Following these best practices helps reduce the risk of bacterial contamination and protects your baby during every feeding.

Currently, there is no research showing whether rinsing, wiping, or refrigerating pumping accessories between sessions is as safe as washing them in hot, soapy water or in a dishwasher using a heated drying cycle.

If You Choose to Use the Fridge Hack

If washing your pump parts with soap and water after each pumping session isn't possible, some mothers choose to store breast pump parts in the refrigerator between uses. Before storing them, rinse away any remaining milk if possible. If rinsing isn't an option, wipe away visible milk residue with a clean, disposable paper towel. Then place the parts in a clean, sealed bag or airtight container and refrigerate them until your next session.

Keep in mind that refrigeration is intended only for temporary storage of the pump parts—not for breast milk storage itself. Always follow breast milk storage guidelines for expressed milk stored in separate bottles or storage containers.

Safer Alternatives to The Fridge Hack

If washing with soap and water after each pumping session isn’t possible, here are some safe alternative options:

Bring Extra Pump Parts

  • Pack multiple sets of clean pump parts for the day.
  • After each pumping session, place the used set in a sealed bag until you can wash them at home.

  • This is one of the best ways to avoid needing to clean parts when you don't have easy access to a sink or enough supplies.

Use Pump Wipes or Sprays

  • Disposable breast pump cleaning wipes are made for quick cleanup.
  • Sanitizing sprays can add a second layer of protection after wiping, when soap and water aren’t available.
  • They’re not a full replacement for regular cleaning, but they can remove milk residue and reduce the growth of bacteria between sessions.

Microwave Steam Bags

  • These single-use or reusable bags allow you to sanitize pump parts in a microwave with a little water in just a few minutes.
  • They’re convenient if your workplace or travel location has microwave access.
  • Always check your pump manufacturer’s instructions to confirm which parts are microwave-safe before using this method.

Bottom Line...

Pumping is already a lot of work, and finding shortcuts that fit your lifestyle can make it feel more manageable. While the Fridge Hack is a popular time-saver, the safest approach is still washing everything after each use.

If that’s not always possible, planning ahead with extra supplies, cleaning wipes, or microwave steam bags can help make your pumping routine more manageable while supporting good pump hygiene. Every family's routine looks a little different, and doing your best to keep your pump parts clean is one more way you're helping protect your baby while providing the benefits of breast milk.

If you have questions about pumping, cleaning your breast pump, or finding a routine that works for your family, don't hesitate to reach out to one of our lactation consultants. We're here to provide personalized, evidence-based guidance to help you meet your feeding goals with confidence.

You’re doing an amazing job, and every ounce is worth celebrating!

Disclaimer: Our classes and accompanying materials are intended for general education purposes and should not replace medical advice. For personalized recommendations, please consult your healthcare provider and/or lactation consultant.