How To Know Flange Size For Breast Pump

Flange Size Ruler Printable Printable Word Searches
Flange Size Ruler Printable Printable Word Searches from


Choosing the right flange size for your breast pump is crucial for effective and comfortable pumping. A flange that doesn’t fit properly can result in discomfort, reduced milk supply, and inefficient milk removal. In this article, we will guide you through the process of determining the correct flange size for your breast pump.

Understanding Flange Size

The flange is the part of the breast pump that fits over your breast and nipple. It creates a seal around the areola to create a vacuum and stimulate milk flow. Flanges come in different sizes to accommodate various nipple sizes and breast shapes.

Signs of Incorrect Flange Size

If your flange size is incorrect, you may experience discomfort, nipple pain, or reduced milk output during pumping. It is important to identify these signs and take steps to find the right flange size for you.

Measuring Your Nipple Size

First, you need to measure your nipple size to determine the appropriate flange size. To do this, you can use a ruler or measuring tape. Gently compress your areola to flatten it and measure the diameter of the base of your nipple in millimeters.

Choosing the Correct Flange Size

Using your nipple measurement, you can refer to a flange sizing chart provided by the breast pump manufacturer. This chart will help you find the recommended flange size based on your nipple diameter. Keep in mind that different brands may have slightly different sizing guidelines, so it’s best to consult the specific chart for your breast pump.

Trying Different Flange Sizes

It’s important to remember that the recommended flange size is a starting point. Every woman’s breasts and nipples are unique, so you may need to try different sizes to find the most comfortable fit. Start with the recommended size and observe how your breasts and nipples feel during pumping.

Signs of a Proper Fit

A properly fitted flange should allow your nipple to move freely within the tunnel without rubbing or pressing against the sides. It should not cause any pain or discomfort. Additionally, you should see a rhythmic pulling motion on your nipple during pumping, indicating effective milk removal.

Consulting with a Lactation Consultant

If you’re still unsure about the correct flange size or experiencing difficulties with pumping, it’s advisable to consult with a lactation consultant. They can assess your breastfeeding situation, observe your pumping technique, and provide personalized recommendations to improve your pumping experience.

Regular Reevaluation

It’s important to note that flange size may change over time. Factors such as weight loss, breast engorgement, or hormonal changes can affect the size and shape of your breasts and nipples. Therefore, it’s recommended to regularly reevaluate your flange size and make adjustments if needed.


Choosing the correct flange size for your breast pump is essential for comfortable and effective pumping. By measuring your nipple size, referring to a flange sizing chart, and trying different sizes, you can find the perfect fit. Remember to consult with a lactation consultant if you need further assistance. Regular reevaluation of flange size is also important to accommodate any changes in your breasts and nipples. Happy pumping!