Using the correct sized breastshield is really important to have the most comfortable pumping experience. We are all different shapes and sizes, and it can be really hard to know which breastshield size you will be when you start pumping.
A baby's mouth compresses a nipple evenly all over the nipple and areola, whereas a breastshield flange is rigid. As a result, if your flange is too large, the areola will 'bunch' up into the flange, which can cause pain and nipple trauma. You want the flange to be just wide enough to fit the base of your nipple, preventing the areola from being able to get pulled into the flange.
Using our nipple ruler is a good place to start.
If you've used the ruler and you're still not sure, we're happy to help with another opinion. If you'd like us to give you feedback, please take a photo of your nipple through each size so we can compare how each fits. You can send your pics through the 'chat' function at bottom right of the page.
For extra help, send a video of your nipple in the flange while you're pumping through our Fitting Room.