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How To Find The Best Breast Pump Flange Size

Discovering the ideal flange size can profoundly impact your pumping experience. Utilize the tools provided below to ascertain the perfect fit!

WHAT IS A BREAST PUMP FLANGE?

A breast pump flange, also referred to as a breast shield, serves as a plastic component designed to fit snugly over your nipple, creating a seal around the areola. Its purpose is to establish a vacuum seal that delicately draws your nipple into the flange tunnel, facilitating the extraction of milk. While the standard size for flanges is often 24mm, it's important to consider your own measurements and pumping experience, as you may require smaller or larger flanges for optimal efficiency.


The improper flange size may have various adverse effects on breastfeeding, including reduced milk supply, nipple pain, and damage. It can even lead to complications like clogged milk ducts and mastitis due to ductal narrowing. On the other hand, ensuring the right flange size is crucial for proper pump suction and effective milk removal.

For those using a breastfeeding pump for the first time, seeking guidance from a lactation specialist can be highly beneficial. They can assess your nipple size, areola density, and fullness to determine the appropriate flange size, significantly enhancing your pumping experience.

HOW TO FIND THE RIGHT FLANGE SIZE

  1. Before measuring, avoid pumping, but do gently stimulate your nipple. 

  2. To determine the diameter of your nipple, utilize either a measuring tape or a silicone flange measuring tool. Measure your nipple in millimeters at its widest part, usually the base. 

  3. Many moms have found that adding 1-3mm to their nipple size yields the most comfortable and effective flange size

AVAILABLE SIZES

Available in sizes ranging from 10mm to 40mm, flanges and sizing inserts (silicone inserts that reduce the size of 24mm flanges) can be obtained. If your pump's manufacturer doesn't offer your specific flange size, don't worry. A Lactation Consultant can assist you in finding a suitable flange or sizing insert that is compatible with your pump.

THE COMFY TEST

Use the acronym "COMFY" to aid in determining your flange size. This guideline was specifically designed to assist mothers in recalling the 5 essential factors for breast shield sizing.

C
CENTER NIPPLES BEHIND THE FLANGE OPENING

Ensure that your nipple is positioned centrally within the flange opening. If your nipple moves in and out of the tunnel comfortably without redness or pain, the flange size is likely appropriate. If discomfort occurs, it might indicate that the flange is too small.

O
ONLY A LITTLE AREOLA TISSUE SHOULD BE PULLED INTO THE TUNNEL

During pumping, you may notice a small amount of areola tissue gently being drawn into the tunnel along with your nipple. This is normal if the flange size is right. However, if there is no areola movement, the flange might be too small, and if there is excessive movement, it might be too big.

M
MOTION OF YOUR BREAST IS GENTLE AND RHYTHMIC

Observe the movement of your breasts during pumping - it should be gentle and rhythmic, mirroring the motion of your nipple. This indicates that your breasts are being properly stimulated for expressing breast milk.

F
FEELS COMFORTABLE BREAST PUMPING

Your breastfeeding pumping experience should be comfortable, free from any pain or tenderness. If you experience discomfort, it could be due to using the wrong-sized pump flange.

Y
YIELDS WELL-DRAINED BREASTS

After each pumping session, your breasts should feel soft and lighter, indicating that they have been adequately drained of milk.

By following the "COMFY" guidelines, you can ensure a more comfortable and effective hands-free breast pumping experience.

WILL MY FLANGE SIZE CHANGE?

Certainly! Your breasts have the potential to undergo changes during different stages, such as from the third trimester to postpartum after giving birth. Additionally, breast changes may occur during your breastfeeding pumping journey. Therefore, it is essential to monitor your flange size regularly to avoid discomfort and maintain efficiency during pumping sessions.

Choosing the right breast shield size is crucial for effective milk expression and pump performance. Great news! You might qualify for brand-new double electric breast pump supplies that are covered by your insurance. By receiving these resupply items, you can ensure that you always have the correct flange size for a comfortable and efficient pumping experience.

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