Flange Sizing and The Eufy S1/S1 Pro and E10 Wearable Pumps
Proper flange sizing and understanding your breast pump’s suction mechanism are key to a comfortable and effective pumping experience. If you’re using the Eufy S1, S1 Pro, or E10 wearable breast pumps, this guide will walk you through everything you need to know about proper sizing, troubleshooting, and maximizing your pump’s performance.
Understanding Standard Suction Pumps
The Eufy S1/S1 Pro and E10 are standard suction pumps that operate using a pull-and-release mechanism. This means the nipple is pulled forward during suction, and the pressure resets to zero between cycles. For optimal comfort and effectiveness, it’s critical to:
Keep the areola out of the flange tunnel, allowing only the nipple to move freely.
Ensure the nipple has enough space within the tunnel for unrestricted movement without excessive compression.
Why Flange Sizing Matters
Incorrect flange sizing is a common issue for wearable breast pumps, as visibility through the pump’s flange is limited. Wearable pumps require careful sizing to ensure comfort and prevent issues like reduced milk flow or pain.
Recent studies suggest measuring the tip of the nipple for initial sizing, but with wearables, this approach can fall short. Instead, measuring the base of the nipple is a more reliable method, especially when combined with factors like anatomy type and tissue elasticity.
Measuring Your Nipple for Wearables
Here’s how to measure your nipple for the best fit:
Measure the base of your nipple, at least 2 hours before pumping or 1 hour after nursing.
Add 0-4mm to this measurement to determine your flange size, based on tissue elasticity.
Most users will need a flange 2mm larger than their nipple base measurement.
For very elastic tissue, closer to exact sizing is recommended.
If you’re struggling with this process, professional help is available. Virtual or non-live sizing using photos and videos can provide more precise results.
Avoiding Motor Failure: Why Sizing Is Critical
Using flanges that are too small can lead to “corking,” where overly compressed tissue blocks suction. This not only causes discomfort but can strain the pump’s motor, leading to overheating and eventual failure—often not covered under warranty.
Recommended Inserts for Eufy Wearable Pumps
Inserts are a game-changer for wearable pumps, offering improved fit and comfort. Here are some top-performing options:
Legendairy Milk Inserts
Sizes: 15mm to 21mm
Features: Wide air seal, smooth texture, and excellent flexibility.
Best for: Most wearers due to its versatility and comfort.
Mercy Luna Inserts
Features: Silky silicone design with extra flex.
Best for: Users needing more movement within the flange.
Willow Inserts
Features: Fin-like design for less movement in the flange.
Best for: Users with less elastic nipples or those seeking reduced flange movement.
Pumping Pretty Inserts
Features: Shorter design for shallow flange needs.
Best for: Broad, basketball-shaped breasts with minimal nipple elasticity.
Maymom Inserts
Features: Soft rims and a variety of sizes, including even numbers.
Best for: A wide range of users needing moderate flexibility.
Tips for Eufy S1/S1 Pro and E10 Pumps
Use the newer Eufy inserts without holes for safer and more consistent results.
If you have elastic nipples, avoid overly compressive inserts to prevent discomfort and poor suction.
For troubleshooting suction issues, plug the pump with your thumb and observe flange flex to ensure proper fit.
When to Seek Professional Help
Around 40% of moms struggle with flange sizing, even with detailed instructions. If you’re one of them, know that help is available. Lactation consultants can size you virtually, allowing for precise adjustments based on your anatomy and pump performance.
Helpful Resources from Genuine Lactation
For additional support and information, check out these resources from Genuine Lactation:
Flange Sizing Guide: https://www.genuinelactation.com/flange-sizing
Flange Sizing and Wearable Pumps: https://www.genuinelactation.com/blog-for-breastfeeding-families/flange-sizing-and-wearable-pumps
Why Does Flange Size Really Matter?: https://www.genuinelactation.com/blog-for-breastfeeding-families/why-does-flange-size-matter
Virtual Flange Sizing Services: https://www.genuinelactation.com/blog-for-breastfeeding-families/how-does-virtual-flange-sizing-work
Final Thoughts
The Eufy S1, S1 Pro, and E10 pumps are excellent tools for busy moms, but proper sizing and setup are essential for success. Take time to measure carefully, explore different inserts, and don’t hesitate to reach out for expert advice if needed.
Happy pumping!
