Flange Sizing Matters (!!)

Truly, I am learning to walk here.

Ok, not walk, but how to begin the tooth-pulling process of changing parents' and lactation professionals' minds about how flanges should fit a lactating person.

In November 2024, a study was published on flange sizing for pumping parents. This study was monumental for parents who pump, as it confirmed what had previously been assumed. Flange sizes that come with most breastpumps are too big! This study found that on average, a parent's nipples measure 15-17 mm, and that flange sizing correlates directly with this measurement. There is no need to add or subtract millimeters to a parent's nipple size when choosing a flange, as was previously recommended (and this is still recommended by several pump companies). An ideal flange fit is comfortable for the wearer, yields milk, and results in no changes or trauma to the nipple after use.

I have been able to utilize these findings in my practice as an IBCLC in Kansas City, MO, and the results are phenomenal! Parents are noting a 'gentle tug' with their double electric pump, in most cases at a vacuum strength over double what they were able to tolerate with a larger flange. Most importantly, they are pumping for less time (every minute counts!), their breasts are feeling softer with the smaller flange size, and they are not in pain.

Questions about this article? Check out the full link here.

We also offer free virtual flange fittings — expert-guided advice online, with the option to purchase your chosen flange size at a discounted price after the fitting.

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