Flange Sizing: Your in-depth guide

Written by Angel Yarbor, Edited by Jen Meuller IBCLC, illustrations 

by Natasha Dodge

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Flange sizing may seem like a foreign concept when first embarking into the world of bodyfeeding. In fact, you probably never heard of a flange until deciding to pump for your little one, opening your breast pump packaging, finding all of those goodies inside, and asking yourself, &#;what is this thing?&#;  

Honestly, we&#;ve all been there! 

Well, good news, we&#;re here to help!

First, What is a flange?

A flange is the funnel part of a pump that makes contact with the breast. Having the proper flange tube size can greatly impact how your pumping experience may ensue. Ensuring you have the correct fit is very important. 

Want more information on Proper Fitting Flange For Breast Pump? Feel free to contact us.

You might ask why the fit is so important?

Flanges come in various sizes with tubes ranging from 15 to 36mm and larger,&#; however, in most cases, full pump starter kits come with about a size 24mm flange. In all actuality, you may need a smaller or bigger size. And, to make it even more fun, you might need two different-sized flanges - one for each side -  to get the job done!

The flange funnel creates a vacuum seal around the areola and the nipple should move freely within the tube. While every brand of pump offers slightly different sizing, the principles are the same for all of them. The video below has a good illustration of proper and improper fit. 

A breast pump flange, also known as a breast shield, is a plastic or silicone piece that fits directly over your nipple to form a seal. When you begin to pump, this creates a vacuum seal that should only draw your nipple into the flange tunnel for maximum milk extraction. Many pumps come with 24mm flanges, but you may need to select smaller or larger flanges based on your measurement and experience when pumping. 

Having the wrong flange size can affect milk supply, cause nipple pain and damage, and can even lead to clogged milk ducts (ductal narrowing) and mastitis.  Having the correct flange size is also key for allowing adequate pump suction and milk removal.

For first-time pumps, seeing a lactation specialist can be helpful in determining the correct flange size for your nipple size as well as areola density and fullness, and can make a big difference in your pumping experience. 

If you are looking for more details, kindly visit Flange Size Too Big.