Mothers may be confused when choosing the optimal breast shield size,  our nipple ruler is a great start to determining the correct breast shield size to use.  
 
The soft silicone nipple ruler is  more comfortable to use than hard plastic tools and more stable than a paper ruler.
 
How to use - 2 ways to measure your nipple
 
Wash your measuring tool with warm soapy water before and after each use.
 
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.
 
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.
5. Don’t forget to measure each nipple individually since you may not get the same measurement on the left and right sides of your chest.
 
If you measure your nipples diameter before beginning to pump or before you have your baby, you will add 3-4 mm to the measurement you found for choosing the correct breast shield size. Adding 1-2mm on nipple diameter to determine breast shield size after pumping. 
 
Note
 
It's important to check your nipple size regularly as it may change throughout pregnancy and your breastfeeding journey.
 
Please consult with a lactation professional if you're experiencing nipple pain or damage.