When it comes to using a breast pump, one of the most important factors for both comfort and effective milk expression is selecting the right flange size. The flange, or breast shield, is the part of the pump that directly interacts with your nipple and breast during pumping sessions. Using the correct size can make a significant difference in the success of your pumping routine. In this guide, we’ll break down the process of measuring your nipple for a breast pump, explain why flange size is so crucial, and offer tips on how to ensure you're using the right flange for optimal comfort and milk production.

What is a Breast Pump Flange?

Definition of a Flange

A breast pump flange, sometimes referred to as a breast shield, is a crucial component of your breast pump system. This part fits around the nipple and areola (the darker area surrounding your nipple) to help create the suction needed for effective milk expression. It is essential for ensuring that milk is efficiently drawn from the breast into the collection container. Flanges come in various sizes to accommodate different breast shapes and sizes, and choosing the right one is key to a comfortable and successful pumping experience.

Role in Pumping

The flange is at the heart of how a breast pump works. Its primary role is to create the vacuum that pulls milk from the breast. When placed correctly, the flange forms a seal around your nipple, allowing the pump to generate the necessary suction to express milk. The suction cycle mimics your baby’s natural nursing rhythm, stimulating your milk flow. Without a properly sized flange, the pump’s suction may not function as effectively, which could lead to discomfort or a less efficient pumping session. A good fit is essential for smooth milk expression and overall pumping success.

Why Is Flange Size Important?

Selecting the correct flange size is one of the most important decisions you can make when using a breast pump. The right flange ensures that you’re not only comfortable but also getting the most out of your pumping sessions. Here’s why the size of the flange matters:

Comfort and Prevention of Pain

Comfort should always be a top priority when it comes to pumping. A flange that is too small can squeeze the nipple too tightly, causing pain, discomfort, or even chafing. If it’s too large, the nipple may move around inside, which can lead to irritation or friction. Both of these issues can make pumping a painful experience, potentially causing you to avoid or shorten your sessions, which can negatively impact your milk supply. When the flange fits correctly, it helps create a more comfortable and less painful pumping process, allowing you to pump for the recommended amount of time without distress.

Efficient Milk Expression

The right flange size doesn’t just contribute to comfort—it also affects the efficiency of milk expression. When the flange is the right size, the pump’s suction works as it should, effectively stimulating the milk ducts and helping to express milk quickly and efficiently. If the flange is too small or too large, the suction may be compromised. In such cases, milk flow can slow down, and the amount of milk expressed in each session may be less than desired. The proper flange size allows the pump to function optimally, helping you get the most milk in the shortest amount of time.

Avoiding Issues Like Clogged Ducts

An ill-fitting flange can lead to more than just discomfort—it can also cause serious breastfeeding issues, such as clogged ducts. If the flange is too tight, it may restrict the flow of milk, causing a buildup in the milk ducts. This can lead to engorgement, blocked ducts, or even mastitis if not addressed quickly. On the other hand, a flange that is too large can result in poor suction, meaning milk isn’t fully removed from the breast. This can also lead to blocked ducts and a decrease in milk supply over time. To avoid these problems, it’s vital to ensure the flange fits snugly but comfortably, allowing milk to flow freely and efficiently.

Steps to Measure the Nipple

To find the correct flange size, measuring your nipple is an essential first step. Here’s a simple, step-by-step guide to measuring your nipple for a breast pump:

Step 1: Gather Your Materials

You’ll need a ruler or measuring tape, a mirror, and possibly a nipple size chart (which you can find online or through your pump brand).

Step 2: Stand in Front of the Mirror

Find a comfortable spot to stand in front of a mirror so you can observe your nipple clearly. This will help you measure accurately.

Step 3: Measure the Diameter of Your Nipple

Using your ruler or measuring tape, measure the diameter of your nipple—not the entire areola, just the nipple itself. This measurement is crucial because the flange needs to fit around the nipple comfortably to create a good seal and vacuum.

Step 4: Compare with Flange Size Chart

Most breast pump manufacturers provide a nipple size chart or guide that matches nipple diameter with the appropriate flange size. For example, a nipple diameter of 0.75 inches might correspond to a 21mm flange, while a diameter of 1.25 inches might require a 25mm flange.

Step 5: Double-Check

It’s always a good idea to measure more than once to ensure accuracy. Some women have slightly different nipple sizes, so take a second measurement for both breasts to confirm the correct size for each.

How to Choose the Right Breast Shield for the Pump

Once you've measured your nipple, the next step is to select the right breast shield size for your breast pump. Here’s what you need to consider:

Matching Size with Pump Options

Different breast pump models may offer a range of flange sizes. The size chart provided by the breast pump manufacturer will guide you in choosing the right flange. Some pumps come with multiple sizes in the kit, so you can experiment with different sizes until you find the most comfortable one.

For example, the MomMed S21 Breast Pump includes a variety of flange sizes (17mm, 19mm, 21mm, and 24mm) right in the box, making it easy to find your perfect fit without needing to purchase additional accessories. Its thoughtful design ensures that moms of all nipple sizes can pump comfortably from the start.

Consider Pump Brand Variations

Keep in mind that flange sizing can vary slightly between different pump brands. For example, a 24mm flange from one brand might be slightly larger or smaller than a 24mm flange from another brand. It’s always best to check the manufacturer’s guidelines to ensure you’re selecting the right size for your specific pump.

Adjusting for Comfort

Some pumps also allow for small adjustments to the flange size. For instance, there may be options for adjusting the breast shield to suit your comfort level. Make sure to try these adjustments before settling on the final size. Additionally, some manufacturers offer flange inserts that can be added to the flange for enhanced comfort.

How to Tell If You’re Using the Correct Flange Size

Once you’ve chosen your flange size, it's important to monitor your pumping experience and make sure the flange is working as it should. Here’s how to tell if you’re using the correct size:

Signs of a Good Fit

When the flange is the correct size, pumping should feel comfortable and efficient. Look out for these positive signs:

• Comfortable Suction: The suction should feel strong but not painful. You should feel the breast being drawn into the flange without discomfort or irritation.
• Efficient Milk Flow: Milk should flow easily from your breast into the bottle. If you notice that milk flow is slow or inconsistent, the flange might not be the right size.
• No Pinching or Chafing: Your nipple should not be pinched, squeezed, or chafed during pumping. A correctly sized flange will allow the nipple to move freely in and out of the flange without friction.
• No Visible Pain Indicators: If you're experiencing visible signs of pain, such as redness or swelling on the nipple, the flange is likely too small or too tight.

Signs of an Incorrect Fit

If you notice any of the following, it’s likely that your flange size is off and adjustments are needed:

• Pain or Discomfort: If you feel pinching, tugging, or rubbing, the flange is likely too small or too tight.
• Poor Milk Output: If milk is not flowing or you’re having trouble expressing milk, the flange may not be creating enough suction, which could be a sign it’s too large.
• Nipple Damage: If your nipple is sore, cracked, or bruised, the flange might be too small.
• Ineffective Suction: If the flange is too large, it may cause the nipple to move around inside the breast shield, resulting in ineffective suction and minimal milk flow.

Adjusting as Needed

Finding the perfect flange size can take some trial and error, and that’s completely normal. Many women need to experiment with a few different sizes before they find the one that works best for their body. If you find that your flange isn’t providing the comfort or efficiency you need, don’t worry! Many breast pump brands offer a variety of flange sizes, so you can switch to a different size to see if it makes a difference.

Some breast pump brands even offer flange inserts or soft cushions that can help provide extra comfort, especially if you’re between sizes. These cushions can help create a better seal and provide a softer, more comfortable fit. It’s all about finding what works best for you and your body’s needs.

Conclusion

Selecting the correct flange size for your breast pump is essential for both your comfort and milk production. By measuring your nipple carefully, choosing the right breast shield, and paying attention to how your body responds while pumping, you can ensure that you’re using the correct flange for optimal performance.

Remember that every woman’s body is different, and finding the right flange size may take a little trial and error. Don't hesitate to adjust as needed, and always choose comfort first. With the right flange, pumping can become a more efficient and comfortable part of your breastfeeding journey.