If you’re shopping for flange sizing inserts to improve comfort and pumping efficiency, you’re in the right place. This guide highlights five sizing kits designed to help moms find the right fit for 24mm flanges/shields. They’re ideal for gradually customizing size, reducing rubbing, and boosting milk expression. The best options are BPA-free silicone inserts from trusted brands, each suited to different pumping setups and comfort goals.
| Product | Size Range | Best For | Notes |
|---|---|---|---|
| Nuliie 3-in-1 Flange Sizing Kit | 13/15/17/19/21mm | Moms needing a precise downsize from 24mm | Includes 10 inserts; dishwasher safe |
| Nursi Luna Flange Sizing Kit 3-in-1 | 13/15/17/19/21mm | First-time sizing with IBCLC guidance | Soft silicone; includes sizing guidance |
| Nursi Luna Flange Inserts 10PCS | 13/15/17/19/21mm | Multiple sizes for ongoing fit changes | Strong focus on comfort |
| LOTBILL Flange Insert 13/15/17/19/21mm | 13/15/17/19/21mm | Wide compatibility with many 24mm flanges | Includes measuring tool and brush |
| Nuliie 5-in-1 Flange Sizing Kit | 12/14/16/18/20mm | Alternative sizing with a broader range | 10 inserts; dishwasher safe |
Nuliie 3-in-1 Flange Sizing Kit
Best for: Mothers who want a compact, ready-to-use sizing set for quick adjustments. This kit reduces a 24mm shield to 13/15/17/19/21mm, offering a wide range without switching pumps. Note: Not compatible with 27–28mm shields.
- Compatibility: Fits most 24mm flanges for electric double pumps and manual pumps
- Material: BPA-free silicone; soft, flexible, and washable
- Care: Dishwasher safe; replace every 2 months for optimal performance
Caution: Some users find the smallest sizes less effective if nipple diameter is significantly larger than the tunnel; measure before purchase.
Nursi Luna Flange Sizing Kit 3-in-1
Best for: Moms seeking guidance from an IBCLC-developed kit to find the correct size and reduce discomfort from the start. It targets improved efficiency by ensuring a comfortable seal and fit.
- Sizes: 13/15/17/19/21mm (5 sizes)
- Material: BPA-free silicone; softer than hard plastics
- Guidance: Includes measurement support to help track fit changes
Caution: Not compatible with 27–28mm shields; verify your flange size before ordering.
Nursi Luna Flange Inserts 10PCS
Best for: New moms needing adjustable comfort across a pumping journey with consistent size options. These inserts help reduce rubbing and support better milk expression.
- Sizes: 13/15/17/19/21mm, 10 pieces
- Material: BPA-free silicone; comfortable and gentle
- Compatibility: Fits most 24mm flanges; not universal for all 24mm models
Limitation: Some flanges may require additional adapters depending on brand-specific tolerances.
LOTBILL Flange Insert 13/15/17/19/21mm
Best for: Buyers needing a comprehensive set with a measuring tool and cleaning brush for accuracy and upkeep. It helps reduce the 24mm tunnel to the right size for improved comfort.
- Sizes: 13/15/17/19/21mm (10 inserts total)
- Compatibility: Works with many 24mm wearable pumps (not 27–28mm shields)
- Extras: Includes a nipple measuring tool and cleaning brush
Caution: The set excludes larger 24mm variations beyond 21mm; check your pump model’s tolerances.
Nuliie 5-in-1 Flange Sizing Kit
Best for: Moms who want a broader size range and a practical alternative to the 3-in-1 kit. It offers 12/14/16/18/20mm sizes for precise tailoring.
- Sizes: 12/14/16/18/20mm
- Material: BPA-free silicone; easy to clean
- Care: Dishwasher safe; includes a complimentary cleaning brush
Limitation: Not all 24mm flanges will align perfectly with every pump model; size verification remains essential.
Buying Guide: Flange Sizing Kits For Breast Pumps
What size should you choose? Start with a correct measurement of nipple tunnel diameter and base width. Silicone inserts should feel soft and create a comfortable seal without rubbing. Consider pump type (electric vs manual) and flange brand compatibility when selecting a kit.
- What is the goal of sizing inserts? To reduce tunnel size to fit your 24mm flange and improve suction without discomfort.
- Are silicone inserts better than plastic? Silicone is typically softer and more forgiving against the skin, which can reduce irritation over longer pumping sessions.
- How many sizes to start with? A 3-in-1 or 5-in-1 kit provides multiple options for quick adjustments; you can refine fit as your nipples or milk production changes.
- How to care for inserts? Wash promptly after each use, avoid abrasive cleaners, and replace every 2–3 months for optimal performance.
- Do these kits work with all pumps? They fit most 24mm flanges, but always verify compatibility with your specific model and shield size.
FAQ
- Q: Will a smaller size increase milk flow? A: A properly sized tunnel reduces friction and can improve comfort, which may help with consistent pumping sessions.
- Q: Can I mix sizes on different days? A: Yes. Some moms switch sizes between sessions to match comfort and flow needs on each side.
- Q: Do these inserts require special cleaning tools? A: Basic cleaning brushes are commonly included; a dedicated nipple brush can help thorough cleaning.
- Q: How do I know if I need a 12mm vs 21mm size? A: Start with the middle range and adjust based on comfort, seal quality, and suction efficiency.
- Q: Are there safety concerns with silicone inserts? A: Choose BPA-free silicone from reputable brands and ensure proper cleaning to prevent contamination.