Momcozy M5 vs. M6: A Real-World Comparison From a Breastfeeding Mom and Lactation Counselor
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If you’re shopping for a wearable pump, chances are Momcozy has popped up on your radar. They’ve released so many models lately that it’s hard to keep track. I do appreciate that they offer more affordable options than some competitors, but the constant stream of new releases can make it tough to decide which one to go with. Two of the most popular right now? The Momcozy M5 and M6.
Here’s everything you need to know if you’re debating between the two, with key differences, personal pros and cons, and what might work best for your body and lifestyle.
First Things First: Wearables Are Secondary Pumps
Let’s get this out of the way: wearables should never replace your primary pump. They are incredibly convenient, especially for on-the-go or multitasking at work, but most moms (myself included) don’t get the same output from wearables as they do from a primary pump with traditional flanges.
That said, a good wearable can still make a huge difference in your pumping routine.
It’s also important to know that wearable pumps are notoriously inconsistent. What works great for one person might fall flat for another, and Momcozy is no exception. Some moms absolutely love their Momcozy pumps and get great output, while others don’t respond as well to them. So buying a wearable can feel like a bit of a toss-up—it may take some trial and error to find what works best for your body.
Don’t feel like reading the full review? Watch the video version here!
Design & Fit: M5 vs. M6
Let’s talk shape, size, and how these pumps feel inside your bra.
The M6 is taller and more contoured to your breast shape. The motor is slimmer but stands a bit higher.
The M5 is shorter and a little bulkier. From the side, both pumps stick out about the same distance from your chest.
Noise level? Very similar. Neither is silent, but both are discreet enough to wear while out and about or around people.
Flanges, Fit, and Elastic Nipples
This is where your personal anatomy really matters—especially if you have elastic nipples.
M5 uses a soft silicone flange, which is sometimes more comfortable and forgiving, especially if you have elastic nipples that stretch deeply into the tunnel.
M6 uses a plastic flange with a silicone edge seal. The tunnel is still plastic, and the diaphragm piece at the end of the flange tunnel is also plastic.
Assembly & Diaphragm Design
The pumps assemble differently:
M5 has a full silicone seal around the collection cup, very familiar if you’ve used other wearables. 4 parts (5 if you use flange inserts) and super simple to put together.
M6 has a unique “snap-in” design (not a literal snap, but a tight fit that clicks together). It’s hard to describe—easier to show in my video—but it gives a solid seal when done right. Also 4 parts, 5 if using inserts.
One thing to note: I’ve had a couple instances where the M6 leaked slightly out the bottom. This was likely user error (hello, 5:30 a.m. pumping sessions), but I do worry about the long-term durability of that seal.
As for diaphragms:
The M5’s diaphragm seems to allow for a longer, smoother pull, which I like.
The M6 diaphragm connects via a plastic piece at the end of the flange tunnel, changing the suction feel slightly.
Capacity, Standing, and Case Design
Milk Capacity: M6 holds ~6 oz; M5 holds just over 5 oz.
Standing Design: M6 stands upright on its own, which is handy. M5 does not. It has to be laying flat
Cases: Both pumps come with very similar cases. The M5’s case is slightly smaller, but functionally, they serve the same purpose.
Modes & Output
Both pumps have the same three modes: Letdown (stimulation), Expression, and Mixed mode.
In terms of motor strength and output, I get very similar results with both pumps. Neither empties me like a wall pump, but they’re consistent and effective enough for occasional wearable use.
Flange Inserts & Pricing
Both pumps come with the same flange inserts: 17mm, 19mm, and 21mm sizes included in the box, which is awesome for customizing your fit (unless you’re smaller than a 17mm, then you’ll have to buy one separately).
M5 Retail Price: $199
M6 Retail Price: $229
You can save more with my discount code: HannahM6F - both on Momcozy’s website and Amazon (Click here for M5 and here for M6)
Final Thoughts: Which Should You Choose?
If you’re stuck deciding, here’s how I’d break it down:
Choose the M5 if...
You prefer or need silicone flanges (especially if you have elastic nipples)
You want slightly smaller, lighter pump cups
You like a slightly longer “pull” in expression mode
Choose the M6 if...
You’re comfortable with or prefer plastic flanges
You want a pump that stands upright
You prefer a slightly more contoured fit in your bra
Discount code again if you’re shopping: HannahM6F - both on Momcozy’s website and Amazon (click here for M5 and here for M6)