Lansinoh Moms' Club

Flanges: How to Get the Right Fit

Pump flanges

First off, what is a flange? Well, it's the piece of the pump that goes around your breast. Here's what you need to know about breast pump flange sizing and fitting.

Properly fitting breast pump flanges:

  • Allow your nipple to move in and out freely without touching or rubbing along the sides
  • Draw in only your nipple and a small portion of your areola

Improperly fitted flanges:

  • Block milk ducts reducing the amount you can express and potentially leading to clogged ducts
  • Cause pain or injury to your nipples

If you're flange is too small, you'll notice:

  • Your nipples touching or rubbing along the sides of the tunnel
  • A feeling of pinching or soreness in the nipple when pumping
  • Your breasts don’t feel empty after pumping, or it take a long time for them to feel empty
  • Your nipple will be misshaped when you finish pumping

If your flange is too large, you'll notice:

  • A large portion of your areola is pulled into the tunnel

What else should I know?

  • Our pumps come with two flange sizes and our best advice is to try both sizes and see which one fits your the best and is most comfortable.
  • Soft, flexible silicone rims on Lansinoh Breast Pump Flanges feel more comfortable against the breast without needing to use a flange insert
  • Use with a Simple Wishes Pumping Bra to have a hands-free pumping session while maintaining suction

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