Does Flange Sizing Change Over Time? Absolutely! Here’s What You Need to Know
We’ve been saying this for years—flange sizing is not static! If you’ve been following us for a while, you might remember our previous blog post, "Did My Nipples Shrink?", where we talked about how nipple size changes throughout lactation and why you should reassess your flange size regularly.
At Genuine Lactation, we don’t just talk about flange sizing—we live and breathe it. We have supported thousands of pumping parents in finding their optimal flange size, helping them maximize comfort, efficiency, and milk supply. Not only that, but we also teach lactation professionals how to assess flange fit properly, ensuring evidence-based care reaches even more families. If there’s one thing we know, it’s that flange size matters—and it’s not a one-time decision.
Why Does Flange Size Change?
Many people assume that once they determine their flange size, they never need to check again. That’s simply not true! Flange sizing is a dynamic process influenced by multiple factors, including:
Tissue elasticity – The more babies you’ve had, the more elastic your breast tissue becomes. This means your nipple size may change faster or more dramatically with each subsequent baby.
Pregnancy & postpartum shifts – Nipple size generally increases toward the end of pregnancy, peaks immediately postpartum, and then gradually decreases as milk supply regulates.
Pumping frequency & duration – If you pump frequently (8+ times a day) and for an extended period, your nipple size may continue to change over time.
For most people, the biggest changes happen in the first 6–12 weeks postpartum. Some experience a steady, gradual decrease in nipple size, while others see rapid shifts every week before reaching a stable size.
How Long Does Flange Size Continue Changing?
For exclusive pumpers or those who pump regularly, flange size may continue to change beyond the initial postpartum period. Many pumpers see:
Gradual decreases in size over time as hormones settle and supply regulates.
A dramatic drop during weaning, when milk production slows and breast tissue shifts.
Even if your size stabilizes after the first few months, it’s always worth reassessing if you experience discomfort, pain, or a drop in milk output.
What Happens If You Use the Wrong Flange Size?
Using the wrong flange size isn’t just uncomfortable—it can have serious consequences:
Nipple pain, cracks, or trauma – A poor fit can cause unnecessary friction or excessive stretching.
Decreased milk supply – Inefficient milk removal signals your body to make less milk.
Pump damage – Incorrect sizing can strain the pump motor, causing premature failure. Pumps are expensive—don't let a bad flange size be the reason yours burns out!
When Should You Recheck Your Flange Size?
Our rule of thumb: If you’re experiencing any issues that could be related to flange size, check again!
Signs you might need to reassess include:
✅ Nipple pain or discomfort while pumping
✅ Reduced milk output
✅ A sensation that suction isn’t working as well
✅ A sudden change in how your pump feels
Since flange sizing isn’t static, it’s essential to ensure you’re always using the most optimized size for your body.
Why Trust Genuine Lactation for Flange Sizing?
At Genuine Lactation, we are industry leaders in flange sizing. We don’t rely on outdated, one-size-fits-all recommendations. Instead, we:
🔹 Use a proven, evidence-based method for assessing flange fit
🔹 Have helped thousands of pumping parents find their best flange size
🔹 Train lactation professionals worldwide on proper flange sizing techniques
🔹 Stay up to date on the latest research to ensure our clients get the best results
We’ve seen firsthand how proper flange sizing changes lives—helping parents pump more milk, eliminate pain, and actually enjoy their pumping experience.
Need Help with Flange Sizing?
Flange fitting doesn’t have to be a guessing game. If you’re unsure whether your size is correct or if you’ve noticed changes in your pumping experience, let us help!
➡️ Book a flange sizing consultation with us today!
Happy pumping!
