Silicone Nipple Measuring Card | Breast Flange Sizing Ruler

Find Your Perfect Flange Fit — Stress-Free

Getting the right breast flange size is one of the most important steps for comfortable, efficient pumping. This Silicone Nipple Measuring Card takes the guesswork out of sizing, helping new and experienced moms quickly identify their correct nipple diameter so they can pump comfortably and maximize milk output.

Made in Mainland China.

Why Proper Flange Sizing Matters

An ill-fitting flange can cause discomfort, reduce milk supply, and even lead to nipple damage. The CDC and leading lactation experts recommend ensuring a proper flange fit as a core part of a healthy breastfeeding journey. Learn more at the CDC Breastfeeding Resource Center.

Key Features

• 13 Sizing Circles: Covers a wide range of nipple diameters in one convenient tool — perfect for all breast pump brands and flange sizes.
• Skin-Safe Silicone: Made from soft, flexible, skin-friendly silicone that is BPA-free, PVC-free, latex-free, nitrosamine-free, and phthalate-free — completely safe for sensitive skin.
• Accurate & Easy to Read: Clear, accurate measurement scales printed directly on the card for quick, reliable readings every time.
• Better Milk Production: Finding the correct flange size promotes a better latch and seal, which can improve breast milk output and overall pumping comfort.
• Simple to Use: Hold the ruler alongside your nipple, use a mirror to align the circle that comfortably fits your nipple without forcing, and note the corresponding size.
• Multiple Color Options: Available in Pink, Green, Light Purple, Light Brown, Matcha Green, and Light Blue.

Specifications

• Material: Silicone (BPA-free, PVC-free, Latex-free, Nitrosamine-free, Phthalate-free)
• Number of Size Circles: 13
• Age Range: Maternity
• Colors: Pink / Green / Light Purple / Light Brown / Matcha Green / Light Blue

Package Includes

• 1 × Silicone Nipple Measuring Card for Breast Flange Sizing

How to Use

1. Hold the measuring card flat against the side of your nipple.
2. Use a mirror to find the circle that fits snugly around your nipple — without pinching or with too much extra space.
3. Note the size number next to that circle — this is your nipple diameter and the basis for your ideal flange size.

Note: Please allow 1–2 mm variance due to manual measurement. Colors may vary slightly from images due to monitor settings.

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Learn more: Breastfeeding

Frequently Asked Questions

Q: How does the silicone nipple measuring card help me find the right breast flange size?

A: The card features 13 graduated circle sizes. Simply hold it against your nipple and find the circle that fits comfortably without pressing into the skin or leaving excessive space around it. The corresponding size number is your nipple diameter, which you can use to match to the correct flange size for your breast pump.

Q: Is this nipple measuring ruler compatible with all breast pump brands?

A: Yes! The measuring card measures your nipple diameter in millimeters, which is a universal measurement used by virtually all major breast pump brands (such as Medela, Spectra, Elvie, Lansinoh, and others) to determine the correct flange size. Simply cross-reference the measurement with your pump brand's sizing chart.

Q: Is the silicone material safe for sensitive skin?

A: Absolutely. This measuring card is made from soft, flexible silicone that is BPA-free, PVC-free, latex-free, nitrosamine-free, and phthalate-free — making it completely safe for use against delicate or sensitive skin.

Q: Can I use this if my nipple size changes over time?

A: Yes! Nipple size can change throughout your breastfeeding journey, which is why the card includes 13 different size circles. You can re-measure as often as needed to ensure you always have the best-fitting flange.