How to Find the Correct Breast Pump Flange Size (And Why Old Advice Is Outdated)
If pumping feels uncomfortable, you're experiencing nipple pain, or you’re having trouble expressing milk, the problem might not be your body—it could be your breast pump flange size. Using the wrong size can make pumping less effective and lead to unnecessary pain.
So, how do you know if you're using the right size? Let's look at what recent research says about flange sizing, how to recognize a poor fit, and what you can do to make pumping more comfortable.
Breast Pump Flange Sizing: What's Changed?
Today, the focus is on how your nipple actually moves inside the flange while pumping.
What does a proper flange fit look like?
- Your nipple should move comfortably: Your nipple tissue should be drawn into the flange tunnel without excessive friction.
- Your nipple should gently contact the tunnel walls: The sides of your nipple should come into contact with the tunnel without being pinched or compressed.
- Minimal areola tissue should enter the tunnel: Most of your areola should remain outside the tunnel during suction.
The goal is a comfortable fit that allows your nipple to move naturally while supporting effective milk expression.
A Simple Hack for Pumping Comfort
If you're experiencing friction while pumping, a little lubrication may help.
Applying a small amount of olive oil or coconut oil to your nipples before pumping can help reduce friction and allow your nipple tissue to glide more comfortably inside the flange.
Even small adjustments to your pumping routine can make a difference in your comfort.
3 Signs Your Breast Pump Flange May Not Fit Properly
Not sure if you're using the right flange size? Your pumping experience can offer some important clues.
Here are three signs it may be time to reassess your fit:
1. Pumping feels painful or uncomfortable
Pumping shouldn't hurt. If you experience pinching, rubbing, swelling, or nipple discomfort during or after a session, your flange size or pump settings may need adjusting.
2. Too much breast tissue is pulled into the flange
Your nipple should move within the flange tunnel, but if a significant amount of areola tissue is being pulled in during suction, your flange may be too large.
3. You're having trouble expressing milk
If you're noticing lower milk output or your breasts don't feel as comfortable after pumping, your flange fit may be one factor worth evaluating. Pump settings, milk supply, and other factors can also affect milk expression.
Your Flange Size Can Change Over Time
Here's something important to remember: your breast pump flange size isn't necessarily permanent.
Your body changes throughout pregnancy and postpartum, and your nipple measurements can change, too. This is especially common during the first few weeks after giving birth.
A flange that worked well initially may not be the best fit a few weeks or months later. If pumping starts to feel uncomfortable or your milk expression changes, it's worth reassessing your fit.
Get Personalized Flange Fitting Support with SimpliFed
You don't have to figure out pumping on your own.
At SimpliFed, our experienced lactation consultants and International Board Certified Lactation Consultants (IBCLCs) understand that every feeding journey is different.
Whether you're preparing to pump, building a pumping routine, or troubleshooting discomfort, we're here to help. Our lactation experts can help evaluate your flange fit, troubleshoot pumping pain, and make recommendations to help you feel more comfortable and confident with your pump.
You don't have to figure out feeding alone.
Connect with a SimpliFed lactation expert for personalized support throughout your feeding journey.
