Find Your Perfect Fit

Using the correct flange size is essential for comfort and efficient milk output. Follow this guide to measure your size.

How to Measure

Stimulate

Stimulate your nipple so it stands up (do not measure when soft).

Measure Diameter

Use a ruler or measuring tape to measure the diameter (width) of your nipple at the base. Do not include the areola. measure in millimeters (mm).

Calculate

Add 1-3mm to your nipple measurement to determine your recommended flange size. The flange should be slightly larger than your nipple to allow movement without rubbing.

Size Chart

Find your nipple measurement on the left to see which flange or insert you need.

Nipple Measurement	Recommended Size
11 - 13 mm	15mm Insert
13 - 15 mm	17mm Insert
15 - 17 mm	19mm Insert
17 - 19 mm	21mm Insert
19 - 21 mm	24mm Flange (Standard)
22 - 25 mm	27mm Flange (Standard)

Note: Most Momcozy pumps come with 24mm flanges included. If you measure smaller than 19mm, we highly recommend purchasing silicone inserts for the best performance.

Check Your Fit

✓

Correct Fit

Your nipple moves freely in the tunnel. You see space around the nipple, but not too much of the areola is pulled in. It feels comfortable.

Too Small

Your nipple rubs against the sides of the tunnel. You may feel friction, redness, or pain during/after pumping.

Too Large

Too much areola is pulled into the tunnel. You may experience low suction or the pump may lose its seal easily.