YOUHA Silicone Nipple Ruler 

Correct sizing of your nipples ensures you can remove the most amount of milk during your pumping session and be comfortable during and after pumping.

Flange Size Guide:
1. Make your nipples larger by stimulating them (do not skip this step).
2. The hole you select can comfortably fit the very bottom of the nipple.
3. Get the corresponding flange size according to the size chart.

By Nipple Ruler:
1. Hold the ruler with 0 lined up with the edge of one side of your nipple.
2. One the other edge of your nipple is the number in millimeters of your nipple diameter.
3. Nipples are not always the same size. Measure each nipple individually since you may not get the same measurement on the left and right sides of your chest.
4. Get the corresponding flange size according to the size chart.

By Circular Guide:
1. Place the nipple into the smallest hole you can comfortably fit into without forcing it.
2. Your nipple should fit completely inside the circle.
3. Make sure you can see your entire nipple inside the circle and right where it meets the areolar tissue.
4. The number in millimeters indicates your nipple diameter.