Quick answer
Choose a flange insert size that matches your nipple diameter measured at the base, with the nipple centered and not rubbing the tunnel walls. The 13-21mm range covers most smaller to average nipple sizes, and the 5-insert bundle lets you test multiple sizes at once.
Why insert size matters more than flange size
A flange insert reduces the tunnel diameter of a standard flange so the nipple fits snugly without excessive areola pull. When the insert is too large, the nipple may swell or rub; too small, and milk flow can be restricted. Getting the right insert size directly affects comfort and output.
The 13-21mm range covers most fit needs
This bundle includes five sizes: 13, 15, 17, 19, and 21 mm. While 21 mm is close to a standard small flange, the smaller sizes (13-17 mm) are especially useful for those with smaller nipples or who have never found a good fit with standard flanges. If your nipple measures exactly between sizes, start with the larger option and check for comfort after a few sessions.
How to choose your insert size
- Measure your nipple diameter: Measure the widest part of your nipple at the base, not including the areola, after a pumping session or when the nipple is at its most erect. Use a ruler or a flange sizing tool for accuracy.
- Match to the closest insert size: If your measurement falls between two sizes (e.g., 14 mm), start with the larger size (15 mm). A snug but not tight fit is the goal—the nipple should move freely without rubbing the tunnel walls.
- Test each size for comfort and output: Use each insert for at least one full pumping session. Signs of a good fit: no nipple blanching, no pain, and milk flows steadily. If you see redness or feel pinching, try the next size up or down. Re-check your size every few months—nipple size can change with breastfeeding stage, weight changes, or between pregnancies.
- Verify compatibility with your flange: These inserts are designed for BabyBuddha breast pump flanges. Confirm that your flange can accept an insert (some flanges have a fixed tunnel diameter). If unsure, check your pump manual or contact support.
Product facts
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Set of 5 inserts (13-15-17-19-21mm): This set includes five flange inserts in sizes 13, 15, 17, 19, and 21 mm, sold as a bundle for convenient sizing options. Having all five sizes in one bundle lets you compare fit without buying individual inserts, saving time and cost if you're still dialing in your size.
Set of 5 inserts (13-15-17-19-21mm)
Who this bundle works for
Best for
- Nipples measuring 13-21 mm in diameter
- Anyone who wants to try multiple sizes without buying individual inserts
- Those who have experienced discomfort with standard flanges and need a smaller tunnel diameter
Not ideal for
- Nipples larger than 21 mm (consider a larger flange or insert set)
- Flanges that do not accept removable inserts (check compatibility first)
