Navigating the world of pumping can be overwhelming – especially if you’re a first-time mom. Whether you’re brand new to pumping or it's been a while, finding the right nipple size to ensure a proper and comfortable experience can seem daunting.

If you're feeling a bit lost, don't worry. We've all been there, and Willow’s here to help make sure your breast pump fits exactly the way it should. Plus, when it comes to nipple and flange sizing, we've got your back with the Willow Perfect Fit Bundle, which includes access to a 1:1 virtual session with a Willow sizing specialist.

Ready to learn more about getting your perfect pump fit? Let’s get into it.

Here's the scoop: your nipples can be a bit unpredictable in size, so it's a good idea to measure both before you dive into the pumping journey and occasionally along the way. Your fit and size can change over time, meaning your perfect fit at the beginning of your pumping journey might not be the same later.

To find your flange fit, you’ll want to pick a quiet moment an hour before or after a pumping or breastfeeding session. Our handy Nipple Size Guide was designed to help you find your perfect fit either with our print-at-home sizing guide or using a measurement app.

With our printed guide, slide them over your nipples, and you’ll know you have the right fit when you find the one that smoothly reaches the base without a touch. Keep in mind your nipples can be different sizes, so be sure to measure both. Once you get your nipple measurement, you can then reference our Flange and Insert Sizing Chart below for nailing the right fit.

One other thing to keep in mind: there's no advantage to having smaller or bigger nipples. It's all about finding your fit for an optimal pumping experience!

Nipple size and flange size don't always match up like puzzle pieces. It can be confusing, but once you know your nipple size, finding your flange size is easy – simply refer to the chart below.

Let's talk about the signs that your flange might not be the right fit. Your areola shouldn't disappear into the flange. Instead, it should be comfortably centered.

You'll feel gentle tugging when you pump, and a bit of soreness and discomfort is normal. If pumping feels painful, it's time to reassess to make sure you are using the right flange size. We also have a Willow Flange Size Guide to help make sure you’re using the correct flange size. Finally, you'll want to pay attention to your milk output. A poor fit can lead to a low output, so if you’re not producing as much milk as you’d expect, it might also be time to check your flange size with the Willow Flange Size Guide.

The Willow Perfect Fit Bundle gives you a personalized sizing experience. With the bundle, we’ve made it easy to take your nipple measurements and try a variety of sizing inserts until you find the combination that works for you.

You also get exclusive access to a 30-minute virtual session with a certified Willow Sizing Specialist. Need a hand with those measurements? They've got you covered. Do you have burning questions about your fit? Willow specialists have the answers.

The set of inserts included in the Willow Perfect Fit Bundle helps ensure the best fit when pumping. When you receive your bundle, you’ll get a set of four inserts (sizes 13mm, 15mm, 17mm, and 19mm) that fit inside the 24mm flange to help you get your perfect flange fit. Sometimes, flanges just need a little extra help. That's where the flange inserts swoop in to save the day, optimizing the fit and turning your pumping routine into a more comfortable experience.

Take your measurements, give the sizing inserts a try, and adjust as needed until you find the perfect fit. And don’t forget, if you’re feeling unsure, access to our Willow Sizing Specialists is also included in the bundle to help answer any questions.

We've covered the ins and outs of nipple sizing, the mystery of flange sizes, and the practicality of the Willow Perfect Fit Bundle to help make sure that your pump fits and operates exactly as it should.

Willow is all about helping you find your perfect fit, and our customer care team is ready to troubleshoot any issues. We believe every mom deserves a hassle-free pumping experience, and we’re here to help along the way.