NOTE - measuring is just the first step. You may need to try multiple sizes before finding the one that works for you.

 

Click on the ruler (with the Maymom logo) to download a print at home nipple ruler (ignore that it says to add 2-4mm - I have revised that advice and will be changing the information soon)

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Please be very careful to read the measurement closely and measure a few mm above the areola - I find a lot of people are measuring themselves too big.