How to Sterilize Breast Pump Parts?

Ever wondered why it's crucial to know how to sterilize breast pump parts? This simple practice is key to safeguarding your baby's health. In this guide, we'll explore the importance of sterilization, identify the specific parts that require attention, and walk you through each step of the process. Join us as we ensure your little one's feeding time is as safe as it is nourishing.


Why ls Sterilizing Breast Pump Parts Crucial?

Sterilizing breast pump parts is crucial for several important reasons, ensuring both the health and safety of infants and the effectiveness of the breast pump itself.

Prevent Bacterial Growth

One of the primary concerns associated with not sterilizing a breast pump is the risk of bacterial growth. Breast milk provides an ideal environment for bacteria to thrive, especially when left at room temperature or warmer. If the pump parts are not properly sterilized after each use, any residual milk left in the pump can become a breeding ground for harmful bacteria. This can pose a risk of contamination when feeding the expressed milk to the baby, potentially leading to gastrointestinal upset or more serious infections.

Reduce Fungal Infections

In addition to bacterial growth, failure to sterilize the pump can also increase the risk of fungal infections, such as thrush. Fungi, like bacteria, can multiply rapidly in warm, moist environments. If the pump parts are not adequately cleaned and sterilized, fungi spores present in the environment or on the skin can contaminate the equipment and transfer to the expressed milk. Infants who consume milk contaminated with fungal spores may develop oral thrush or other fungal infections, causing discomfort and requiring medical treatment.

Promotes Pump Efficiency

Aside from health concerns, neglecting to sterilize the breast pump after each use can also impact its efficiency and performance. Milk residue left in the pump parts can build up over time, leading to clogs, decreased suction power, and reduced milk output. This can be frustrating for breastfeeding mothers who rely on the pump to maintain their milk supply or to express milk efficiently while away from their baby. Regular sterilization helps prevent the buildup of milk residue and ensures that the pump continues to function optimally.

Which Parts of the Breast Pump Need to Be Sterilized?

Understanding the importance of sterilizing breast pump parts is crucial for maintaining a healthy feeding environment for your baby. This essential step ensures that every feeding session is as safe as it is nourishing. So, which parts of the breast pump need this vital attention?

  1. Breast Shields/Flanges: These funnel-shaped parts directly touch your skin and collect the milk, so they definitely need a thorough sterilizing after each use.
  2. Valves and Membranes: These small but mighty parts are vital for your pump's suction. Milk can easily get trapped in these nooks, so sterilizing them is a must to keep things hygienic.
  3. Bottles and Caps: Any part of the bottle that comes into contact with milk should be sterilized to prevent any bacteria from thriving.
  4. Connectors: These parts attach your breast shield to the milk bottles. Since they can come into contact with breast milk, they need to be sterilized as well.
  5. Tubing (if applicable): Not all pumps have tubing, but if yours does and it comes into contact with milk (though it ideally shouldn't), it needs to be cleaned and dried thoroughly. Check your pump's manual because the cleaning method may vary.

Steps to Sterilize Breast Pump Parts

Next, let's walk through the steps to ensure your breast pump parts are properly sterilized, keeping everything safe and hygienic for your little one.

Disassemble and Rinse

After pumping, carefully disassemble the breast pump parts, including the breast shields, valves, membranes, and bottles. Rinse each component with warm water to remove any visible milk residue. Avoid using hot water, as it can cause protein in the milk to adhere to the surfaces, making cleaning more difficult.


Once the parts have been rinsed, wash them thoroughly with mild dish soap and warm water. Use a bottle brush or nipple brush to scrub the inside of the bottles and any hard-to-reach areas. Pay close attention to areas where milk can collect, such as the valve and membrane assembly. Rinse the parts again to remove any soap residue. This step is fundamental in the process of how to clean your breast pump, setting the stage for proper sterilization and safety for both you and your baby.




After cleaning, sterilize the breast pump parts using one of several methods:

  • Steam Sterilization: Place the disassembled pump parts in a steam sterilizer and follow the manufacturer's instructions for sterilization time and temperature.
  • Boiling: Submerge the pump parts in a pot of boiling water for at least five minutes. Ensure that all parts are fully submerged and not touching the sides or bottom of the pot.
  • Chemical Sterilization: Use sterilizing tablets or solution according to the manufacturer's instructions. Soak the pump parts in the solution for the recommended duration before rinsing thoroughly with water.

Dry and Store

Once sterilized, allow the breast pump parts to air dry on a clean, dry surface or use a clean paper towel to pat them dry. Avoid using towels or cloths that may introduce bacteria or other contaminants. Once completely dry, reassemble the pump parts and store them in a clean, covered container until the next use.

We highly recommend eufy wearable breast pump S1 Pro, S1 and E10, where convenience meets cleanliness for your peace of mind. Our pump is not only wearable and lightweight but also capable of holding up to 6 oz (177ml) of milk, catering to your busy lifestyle. With only four parts, it's effortlessly easy to clean, ensuring hygiene without the hassle. We understand the importance of keeping breast pump parts sterilized for your baby's health. Trust eufy to provide a seamless breastfeeding experience while prioritizing cleanliness, because your baby's well-being is our top priority.

eufy Wearable Breast Pump: Pump Warm for a Better Flow

  • The world’s first HeatFlow™ technology revolutionizes pumping for unparalleled comfort.
  • Offers up to 300 mmHg hospital-grade suction power for efficient milk extraction.
  • prioritizes pumping comfort with uniquely angled 105° flanges and soft silicone.
  • Simplifies your pumping routine with the eufy Baby app.


Proper sterilization of breast pump parts is essential for maintaining hygiene and ensuring the safety of expressed breast milk. Neglecting this crucial step can lead to bacterial and fungal contamination, reduced pump efficiency, and potential health risks for the infant. In this article, we learned the importance of sterilizing and how to sterilize breast pump parts.

By diligently following the steps outlined for sterilization after each use, breastfeeding mothers can ensure the optimal performance of their breast pump equipment and provide their babies with safe and nourishing milk.

Frequently Asked Questions

Do You Need to Sterilize the Breast Pump After Each Use?

It's recommended to sterilize breast pump parts after each use to prevent bacterial growth and ensure the safety of expressed milk.

Is It OK To Just Rinse Pump Parts?

Rinsing pump parts is not sufficient for proper sterilization. Thorough cleaning and sterilization are necessary to eliminate bacteria and other contaminants effectively.

How Long Does a Breast Pump Stay Sterilized?

The duration of sterilization depends on the storage conditions. Sterilized breast pump parts should remain sterile as long as they are stored in a clean, dry environment. It's essential to re-sterilize parts if they come into contact with any potentially contaminated surfaces or substances.

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