Exploring the Benefits of the New 18mm Medela Flanges for Breastfeeding Mothers
- Baby Experts
- Dec 27, 2025
- 4 min read
Do you feel unexpressed milk after pumping? Does your nipple rub the tunnel sides? For these or other reasons you may want to consider trying a new breast shield size. One of the key factors that influence comfort and efficiency during pumping is the fit of the breast flange. Medela, a trusted name in breastfeeding products, recently introduced a new 18mm flange size designed to better meet the needs of mothers with smaller nipples. This blog post explores the benefits of the new Medela 18mm flange and how it can improve the pumping experience for breastfeeding mothers.

Why Flange Size Matters
The breast flange is the part of a breast pump that fits over the nipple and areola. The correct flange size is crucial because it affects milk flow, comfort, and the risk of nipple damage. Using a flange that is too large or too small can cause pain, reduce milk output, and lead to clogged ducts or mastitis.
Many mothers struggle to find the right flange size, especially those with smaller nipples. Until now, the smallest Medela flange size available was 21mm, which may not fit all mothers comfortably. The introduction of the 18mm flange fills this gap, offering a better fit for mothers who need a smaller size.
Benefits of the 18mm Medela Flange
Improved Comfort
A flange that fits well reduces friction and pressure on the nipple and areola. The 18mm flange is designed specifically for smaller nipples, which means it can help prevent soreness and irritation during pumping sessions. Mothers who have experienced discomfort with larger flanges often report a more pleasant experience with the 18mm size.
Enhanced Milk Flow
When the flange fits correctly, the nipple moves freely within the tunnel without rubbing against the sides. This allows for more effective milk extraction. Mothers using the 18mm flange have noticed improved milk flow and shorter pumping times, which can be especially helpful for those balancing breastfeeding with work or other responsibilities.
Reduced Risk of Nipple Damage
Incorrect flange size can cause nipple trauma, including cracking, bleeding, and blisters. The 18mm flange helps minimize these risks by providing a snug but gentle fit. This is important for maintaining nipple health and ensuring that mothers can continue breastfeeding comfortably.
Greater Customization
Medela’s new 18mm flange adds to the range of flange sizes available, allowing mothers to choose the best fit for their unique anatomy. This customization supports a more positive breastfeeding journey and can help mothers avoid the frustration of ill-fitting equipment.
Who Should Consider the 18mm Flange?
The 18mm flange is ideal for mothers who find the standard 21mm flange too large. This often includes mothers with smaller nipples or those who experience discomfort or poor milk flow with larger sizes. It is also useful for mothers who have recently started pumping and are still determining their optimal flange size.
Healthcare providers and lactation consultants may recommend the 18mm flange for mothers facing challenges with pumping comfort or efficiency. Trying different flange sizes is a common step in troubleshooting breastfeeding and pumping issues.
How to Determine Your Flange Size
Finding the right flange size involves measuring the diameter of your nipple at the base, not including the areola. Many mothers use a ruler or measuring tape for this. The flange size should be about 2-3mm larger than the nipple diameter to allow free movement without excessive space.
If you measure around 15mm to 16mm, the 18mm flange is likely a good fit. If you are unsure, consult a lactation consultant or try different flange sizes to see which feels most comfortable and effective. When choosing your Medela breast shield size, check out this helpful video.

Tips for Using the 18mm Flange
Start with a clean flange: Always sterilize the flange before use to maintain hygiene.
Check the fit: Your nipple should move freely without rubbing against the sides.
Adjust suction settings: Begin with a low suction and increase gradually to avoid discomfort.
Monitor for signs of irritation: If you notice redness or pain, reassess the flange size or pumping technique.
Replace flanges regularly: Over time, flanges can wear out and affect fit and comfort.
Real Experiences from Mothers
Many mothers who switched to the 18mm Medela flange report a noticeable difference. One mother shared that after struggling with pain using the 21mm flange, the 18mm size allowed her to pump comfortably for longer sessions without soreness. Another mother found that her milk output increased because the smaller flange fit better and created a more effective seal.
These stories highlight how the right flange size can transform the pumping experience, making it more comfortable and efficient.
Where to Find the 18mm Medela Flange
The new 18mm flange is only available through select specialized retailers such as Baby Experts You can find the new Medela 18mm flanges in our online store. It is compatible with most Medela breast pumps, including the popular Pump In Style and Freestyle models.
Before purchasing, check your pump model’s compatibility and consider consulting a lactation consultant to confirm the best flange size for you. Your Baby Experts nurses are always happy to provide you with free guidance on which products best suit your needs. Call or text us today!






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