MomMed S33 Wearable Breast Pump Review
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What Is the MomMed S33 Wearable Breast Pump?
As a mom of five who's currently pumping for my youngest, I've pretty much tried every breast pump out there. My corporate job requires frequent travel away from my baby, which means I need equipment that's compact, travels well, and actually works when I'm away at conferences or stuck in airports.
The MomMed S33 has been my go-to for the past few months. The hands-free design lets me pump while responding to emails or prepping presentations—something that's much more difficult with traditional pumps. But is it actually worth buying, or are there better options out there?
In this review, I'll share my real experience with the MomMed S33 breast pump, including how it compares to other wearable pumps I own such as the Elvie (which costs way more) and the Momcozy S12 Pro (which is bulkier). Let's dig in!
MomMed S33 Wearable Breast Pump
What Is the MomMed S33 Wearable Breast Pump?
The MomMed S33 is a wearable, hands-free breast pump that fits right inside your nursing bra. No tubes, no wires, no sitting hunched over for 30 minutes. You just pop these little units into your bra, turn them on, and go about your business.
Here's what makes these different from traditional pumps. Regular electric breast pumps have tubes and bottles hanging down. You're basically chained to one spot while pumping. The MomMed S33 is completely self-contained—it collects the milk right there in the pump itself.
What's In The Box:
2 pump motor units (one for each breast)
Silicone flange inserts
Duckbill valves and silicone parts
USB-C charging cables
Breast milk storage bags, cleaning brush, storage pouch
Nipple measuring card (super important for ensuring correct flange size!) and breastfeeding guide
Pump parts cleaning brush
The pumps are pretty compact and lightweight. They're designed to work with most nursing bras that have enough stretch and compression to hold them securely against your body.
Key Features and Specifications
The MomMed S33 has 4 pumping modes and 9 different suction levels. There's a massage mode for let-down and expression modes for actually extracting milk. You control everything with a button on top of each pump.
Technical Specs:
4 modes, 9 suction levels
Quiet operation - under 45dB, according to the MomMed website
Built-in night light and LED display
Anti-backflow protection (pump runs 5 seconds after shutoff to clear milk)
BPA-free, food-grade materials
One-tap pause feature
Rechargeable via USB-C
The noise level is under 45dB according to MomMed, which is quieter than a normal conversation. In my experience, you can definitely hear them in a quiet room, but they're quite a bit quieter than traditional pumps. In an office with background noise or in a car, they're pretty discreet.
One thing I really appreciate is the anti-backflow protection. After you turn the pump off, it keeps running for about 5 seconds to clear any remaining milk. This prevents milk from backing up into the motor, which keeps things more hygienic by keeping milk out of those harder-to-clean areas.
The LED display shows your current mode, suction level, and battery status. The built-in night light is actually super useful for middle-of-the-night pumping sessions when you don't want to turn on bright lights or when lighting isn’t great wherever you’re pumping.
MomMed S33 LED Display
Performance: Does The MomMed S33 pump Actually Work?
Ahh, the most important question when it comes to a breast pump review. I've been using the MomMed S33 for about two months now, mostly during work trips and when I need to multitask at home. The suction is decent—not hospital-grade powerful, but adequate for my needs as someone with an established supply who prioritizes convenience and flexibility while I’m on the go.
The suction strength is surprisingly higher than some of the other wearable pumps I own and use. The multiple modes are great for finding the right amount of suction. I don’t think the milk output is quite as high as my Spectra S1 traditional breast pump, but for a wearable pump that offers flexibility and a much smaller size than any traditional pump, the MomMed S33 packs a punch and does a great job.
The let-down mode does quick, light suctions to stimulate milk flow. Once let-down happens, I switch to expression mode which does slower, deeper pulls. The pump works best when you're sitting upright or standing—gravity definitely helps.
Real-World Testing:
Pumping while working at my desk: Works great
Pumping during virtual meetings (camera off): Totally doable. I only do this if I’m on mute just to make sure.
Pumping while driving: It works, though positioning takes practice.
Pumping at airports: Convenient and discreet enough, and it fits really well in my travel bag
Pumping while doing household tasks: Game changer!
If you’re on the go a lot like me for work and need something you can throw into a work bag and use throughout the day, this pump is a great option. If you're exclusively pumping or need to maximize output, you'll probably want something more powerful (i.e. a traditional breast pump). This isn’t a knock against the MomMed S33 in any way other than I haven’t yet found a wearable breast pump that performs as well as a traditional hospital-grade pump. That said, a wearable breast pump is completely necessary for my lifestyle.
Comfort and Wearability
Comfort is huge with wearable pumps. The MomMed S33 comes with three flange insert sizes (17mm, 19mm, and 21mm), which is more options than many wearable pumps offer right out of the box.
Getting the right flange size matters so much, and I definitely recommend utilizing the nipple measurement tool that comes right in the box. DO NOT skip this step as getting the flange size correct ensures that your pumping sessions will be pain-free and maximum milk output.
When I'm wearing them, they're noticeable but not uncomfortable. The pump sits pretty low-profile—it’s slimmer than the Momcozy S12 Pro which I also own and use frequently. Under a loose sweater or cardigan, you can't really tell they're there. Under a fitted shirt, it's more obvious.
For traveling, these are fantastic. They take up minimal space in my carry-on—way less than my traditional Spectra pump with all its parts. The lightweight design means my bra straps don't dig in during longer sessions.
The pump sits low-profile enough to use while walking around or working at a desk, and as long as you're not doing jumping jacks, they stay in place really well.
Battery Life and Charging
Battery life has been solid. The pumps charge via USB-C, which is super convenient because I can use the same cable that charges my phone. I typically get multiple pumping sessions per charge, though the exact number depends on which suction level you're using and how long the pump is on.
Each pump charges independently. There's an LED light that shows charging status—red means charging, green means fully charged. The charging port is on the bottom of each pump.
For travel, I always pack the charging cables and a portable power bank just in case. You can't use the pumps while they're charging, so planning ahead is important if you have back-to-back pumping sessions scheduled.
Cleaning and Maintenance
Cleaning wearable pumps is always more work than traditional pumps, and the MomMed S33 is no exception. You've got multiple parts to wash after every session: collection cups, flanges, silicone valves, and those tiny duckbill valves.
Parts to Clean (per pump):
Milk collector
Silicone breast shield
Flange insert
Duckbill valve
Silicone diaphragm
That's 10 parts total for both pumps. The parts are dishwasher safe (top rack) and can be sterilized. I throw mine in my Momcozy bottle washer at the end of each day, and they fit very well inside there.
If you are hand washing the pump parts, the duckbill valves are definitely the most annoying to clean. They're tiny and milk can get trapped in the slits. The included cleaning brush helps with this.
Even with 10 parts, that is fewer pump parts than some traditional breast pumps.
MomMed S33 vs. Competitors
Since I own multiple wearable pumps and have tested many others, here's how the MomMed S33 stacks up:
vs. Elvie Pump: The Elvie costs over $500 while the MomMed S33 typically retails between $110-150 depending on sales. The Elvie is quieter and has app connectivity, which the MomMed doesn’t offer. If app connectivity is important to you, that would be a consideration. But if that’s not top of your priority list, I think the MomMed S33 offers way better value for most moms. The app connectivity difference doesn't justify spending 3-4 times more.
vs. Momcozy S12 Pro: I owned the Momcozy S12 Pro breast pump before getting the MomMed S33. The Momcozy has slightly stronger suction, but it's noticeably bulkier and more obvious under clothing. The MomMed S33 is more compact with a slimmer profile, which I prefer for traveling and discreet pumping at work. Price-wise they're pretty comparable.
Although later than both the Elvie and the Momcozy S12 to my wearable pump collection, the MomMed S33's more compact design makes it my new top choice for travel and work situations where discretion matters.
Pros and Cons
What I Love:
Truly hands-free—I can multitask while pumping
Affordable compared to premium wearable pumps
Compact and lightweight for travel
Comes with three flange sizes right in the box (17/19/21mm)
Low noise level for discreet pumping
Built-in night light is surprisingly useful
Anti-backflow protection keeps things hygienic
What Could Be Better:
Suction isn't as strong as traditional hospital-grade pumps
Multiple parts to clean after each session
No app connectivity or tracking features, if that’s important to you
Not ideal for exclusive pumping or building supply
Can shift position if you’re not wearing a supportive bra
Who Should Buy This Pump?
The MomMed S33 is perfect if you're a working or traveling mom who needs hands-free pumping throughout the day. It's great for maintaining an established supply but probably not aggressive enough for building supply from scratch or exclusive pumping. For those use cases, I’d recommend a traditional hospital-grade pump. But as far as wearable pumps, the MomMed S33 is an excellent option with great performance, a small design that makes it easy to bring in a bag and to wear discreetly, and fast charging.
If you need maximum output efficiency or you're exclusively pumping, invest in a more powerful traditional pump as your primary pump option for when you’re at home. But for supplemental pumping, occasional use, pumping while on the go, or times when you need to multitask, the MomMed S33 is a truly great breast pump.
Tips for Best Results
Get the Right Flange Size: Don't assume the size that comes installed will work for you. Use the included nipple measurement tool, and you may need to try all three included sizes to find what's most comfortable. Your nipple should move freely without rubbing the sides.
Position Correctly: The flanges need to be centered on your nipple with the pump tilted slightly forward. If they're straight up and down, milk can leak out or pumping may not be as sufficient.
Use a Pumping Bra: I was able to get away with a regular nursing bra with many years of positioning experience and knowing what it’s supposed to feel like, but I always recommend that those who are new-ish to pumping get a specific pumping bra designed for wearable pumps—it makes a huge difference in keeping everything secure.
Experiment with Settings: The 4 modes and 9 levels give you lots of options. Start with massage mode until let-down happens (usually about a minute into my pumping session for me), then switch to expression mode. If flow slows down partway through your session, you can switch back to massage mode briefly to trigger another let-down.
Frequently Asked Questions
Is the MomMed S33 covered by insurance?
Insurance coverage varies by plan. Some insurance companies will cover it with a prescription from your doctor. You can also typically use HSA or FSA funds to purchase it. Contact your insurance provider to ask specifically about the MomMed S33.
How quiet is it really?
According to MomMed specifications, it operates under 45dB. While I don’t have a sound measurement tool and so wasn’t able to independently verify that spec, I can confirm that it’s definitely quieter than traditional breast pumps but not completely silent.
Can I pump both breasts at the same time?
Yes! The MomMed S33 is sold as a set of two pumps specifically for double pumping. Each pump operates independently with its own controls.
What flange sizes are included?
The pump comes with 17mm, 19mm, and 21mm silicone flange inserts. This is more sizing options than many competing wearable pumps offer right out of the box. I recommend using the included nipple measurement tool to ensure you get the flange size correct.
Is it good for exclusive pumping?
For me, with a very established supply as I’m away from my baby for a few days during a work trip, it works great, meets all my needs, and pumps enough milk. That said, if you’re exclusively pumping or looking to establish or increase your supply and will be mostly pumping at your home, there are probably better options. Output is slightly lower than my full sized, traditional, electric pump. I you rely heavily on pumping to grow or maintain your supply, you may want to consider also having a traditional breast pump as well as a wearable breast pump.
How do I clean it?
All parts that touch milk need to be washed after each use—or, if you’re like me, and store your pump parts in the refrigerator between pumping sessions, daily at the end of each day. I like to use my Momcozy bottle washer for daily washing and sterilizing. Parts are dishwasher safe (top rack) and can be sterilized. The motor units themselves don't need cleaning unless milk gets inside.
Final Verdict
After two months of regular use, the MomMed S33 has earned its spot in my pumping routine. It's not perfect—the suction isn't quite as strong as hospital-grade pumps—but for a traveling, working mom like me, the hands-free convenience is absolutely worth it.
The fact that it's so much more affordable than the Elvie (around $100-150 versus $500+) and more compact than the Momcozy S12 Pro makes it my top recommendation for moms who want to try wearable pumps without breaking the bank.
I use both the MomMed S33 and my traditional Spectra pump. When I'm home with time to sit still, I use the Spectra for more complete emptying. When I'm traveling, working, or multitasking, I grab the MomMed S33.
If you're looking for a convenient, budget-friendly wearable pump for supplemental or occasional pumping, the MomMed S33 is definitely worth considering. Just make sure you have realistic expectations about output compared to hospital-grade pumps, and invest in a good pumping bra to keep everything secure.
Feel free to reach out with any specific questions, and happy pumping!
