What Size Breast Pump Flange is Right for You? Finding Your Fit

A breast pump flange, often referred to simply as a flange, is a crucial component of a breast pump. It's the funnel-shaped piece that fits over the breast and nipple during pumping. Flanges come in various sizes to accommodate different breast shapes and sizes.

Recognizing the significance of the flange and knowing how to select the correct size are crucial for ensuring successful and comfortable pumping sessions.

In this article, we'll explore the importance of knowing what size breast pump flange is to suit your needs. We'll discuss the signs that indicate you might be using the wrong size, and we'll address some of the most commonly asked questions on this topic.


How to Determine Your Perfect Breast Pump Flange Size

Selecting the correct breast pump flange size is essential for efficient and comfortable pumping sessions. Here are some factors to consider on how to measure breast pump flange size:

Consider by Nipple Size

One of the key considerations when choosing a breast pump flange size is your nipple diameter. Flanges come in various sizes, typically ranging from small to extra-large, to accommodate different nipple sizes. To accurately determine your nipple size, you can measure the diameter of your nipple at its base when it's in its most erect state, an essential step in understanding how to size your breast pump flange. Keep in mind that your nipple size may change throughout your breastfeeding journey, making it essential to reassess periodically. This practice ensures that you are always using the most comfortable and efficient flange size for your needs.

Comfort and Sensation

Comfort during pumping is paramount for maintaining milk supply and preventing discomfort or pain. Using a flange that is too small or too large can lead to discomfort, nipple pain, or decreased milk flow. When selecting a flange size, aim for one that provides a snug fit around your nipple without causing any pain or discomfort. You should also pay attention to how your breast feels during pumping; if you experience any rubbing, pinching, or soreness, it may indicate that the flange size is not right for you.


Milk Extraction

The efficiency of milk extraction is another crucial factor in determining the right flange size for your breast pump. A properly fitted flange will ensure optimal milk flow and extraction, allowing you to empty your breasts effectively. If you notice that your milk output is consistently low or that you're experiencing uneven milk removal, it could be a sign that your flange size needs adjusting. Experimenting with different flange sizes can help you find the one that maximizes milk expression and minimizes discomfort.

Signs You May Be Using the Wrong Flange Size

Using the wrong flange size can lead to various issues that may impact your pumping experience and milk supply. Here are some signs that indicate you may need to adjust your flange size.

Insufficient Milk Expressing

One of the most common signs of using the wrong flange size is insufficient milk expression. If you're struggling to pump an adequate amount of milk during each session, it could be due to an improper flange fit. A flange that is too small may constrict milk flow, leading to decreased milk output. Conversely, a flange that is too large may not create enough suction to effectively empty your breasts. Monitoring your milk output and adjusting your flange size accordingly can help improve your pumping efficiency.

Visible Symptoms Post-Pumping

Using the wrong flange size can also result in visible symptoms on your breasts and nipples after pumping. If you notice redness, irritation, or swelling around your nipples or areola, it may be a sign that the flange is too small or too large. Additionally, if you experience pain or discomfort during or after pumping, it could indicate an improper flange fit. Paying attention to these visible symptoms can help you identify when it's time to reassess your flange size.

It is recommended the eufy wearable breast pump S1 Pro, where comfort and innovation converge to redefine your breastfeeding journey. The key to maximizing comfort and efficiency lies in selecting the right breast pump flange size. eufy understands this importance and ensures a perfect fit for every user. By prioritizing personalization, eufy empowers mothers to tailor their pumping experience to their unique needs, ultimately enhancing comfort and milk expression.

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.


Choosing the right breast pump flange size is essential for ensuring comfortable and effective pumping sessions. In this article, we learned how to determine what size breast pump flange is by considering factors such as nipple size, comfort, and milk extraction, you can determine the perfect flange size for your needs.

Pay attention to signs such as insufficient milk expressing and visible symptoms post-pumping, as they may indicate that you're using the wrong flange size. Experimenting with different flange sizes and seeking assistance from lactation consultants or breastfeeding professionals can help you find the optimal fit for a successful pumping experience.

Frequently Asked Questions

What Happens If Flange Size Is Too Big?

Using a flange size that is too big can result in several issues. Firstly, it may lead to ineffective milk extraction as the flange may not create a proper seal around the breast, causing air leakage and reduced suction. This can result in decreased milk output during pumping sessions. Additionally, a flange that is too large may cause discomfort or pain as it can stretch and pull on the nipple and surrounding tissue. Prolonged use of an incorrectly sized flange can also increase the risk of nipple trauma and damage.

Can Flange Size Change Over Time?

Yes, flange size can change over time, especially during the breastfeeding journey. Factors such as fluctuations in nipple size, changes in breast tissue elasticity, and variations in milk supply can all affect the ideal flange size. It's essential to regularly reassess your flange size to ensure optimal comfort and efficiency during pumping sessions. As your breastfeeding journey progresses, you may find that you need to adjust your flange size to accommodate these changes.

Will Pumping Hurt If Flange Is Too Big?

Pumping with a flange that is too big can indeed cause discomfort or pain. A flange that doesn't fit properly may rub against the nipple and surrounding tissue, leading to irritation, chafing, or even bruising. Additionally, a flange that is too large may not create a proper seal around the breast, resulting in decreased suction and ineffective milk extraction. Prolonged use of an improperly sized flange can exacerbate discomfort and may impact milk supply.

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