Breast Pump Flange Sizing Guide

Using the correct size breast pump flange (aka breastshield) can help increase supply and decrease discomfort (although I don't think anyone says 'yay, I love expressing, its so much fun' ;) ).  Over time I have found that this is a good way to decide what size you need*: 

Measure the diameter of your nipple where it meets the breast, do not include any of the areola.  Then use this guide to help you decide what size flange to use.  Click here to buy online (flat rate express postage and AfterPay available)


Note that your nipple may get larger over time as it is drawn out from feeding/expressing, or it could decrease as any swelling subsides.  This is the general rule - it may be necessary to try a few different sizes before you find the right fit. 

Inserts to make a 24/25mm flange into a 19mm are now available as well

You are welcome to contact me if you have any questions

*Personally I don't like the print at home, or cut out guides as there is too much potential for errors - if your printer doesn't print the ruler exactly to size, or if you cut the holes out slightly wrong, you could get the wrong size.   I have also found the rule of expressing for 5mins, then measuring and adding 2mm can be inaccurate as sometimes the nipple will swell to meet the flange you are currently using which artifically increases the size


Maymom® sizing  guide

Medela® breastshield sizing tool -

These are the flange sizes sold by Cherished Parenting Services.  They are Spectra® compatible, and work with some Medela® breast pumps (see product description for more info), as well as being compatible with other brands/models with other products.  Other companies may sell different sizes.  Please contact me for more information

For information regarding my services and products during the Covid-19 pandemic please click here

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