Size Guide

Stimulate your nipple until it perks up and measure the diameter of your nipple in mm, from base to base. You can measure it with any ruler, an online ruler, or our printable sizing tool.

Then choose the corresponding flange size:

If you hesitate between two sizes, choose the larger size for greater comfort, and the smaller size for greater performance. For information, the most common sizes are 21mm and 24mm. All flange sizes are available individually on our website.

If you need two different sizes for each breast:
• If you are buying a double Perifit Pump, add two single Perifit Pumps of different sizes to the cart and apply the discount code MIXMATCHDOUBLE.
• You can also opt to buy an additional flange.

Tips for detecting the wrong size:
• Your nipple rubs against the sides of the tunnel and creates discomfort or irritation: your flange is probably too small
• Excess areola tissue is sucked into the tunnel: your flange is probably too large
• Is there any visible redness?
• Is your nipple or areola turning white?
• Do you feel that not all your milk has been pumped after expression? If you find yourself in one of these situations, we recommend that you try a different size flange. Do not hesitate to contact us to help accompany you with your choice!