Some links on our site may earn us a commission at no extra cost to you. Learn more.
Feeding decisions are personal and medical circumstances vary. This comparison covers equipment only. For latch issues, supply concerns, pain, or any feeding question, talk with a lactation consultant or your healthcare provider. And follow each pump manufacturer’s instructions for use and cleaning.
Updated August 2026: Elvie replaced the Stride with the Stride 2 and roughly doubled its suction claim on the box. Momcozy replaced the S9 with the S9 Pro and stopped publishing a suction figure at all. The Medela unit with independent lab data has become an insurance-channel purchase rather than a general-retail one. Every price, model number and score below reflects what you can actually buy today.
The Spectra S1 Plus is the only breast pump whose independently measured numbers still describe the exact unit on sale. Those numbers are 250 mmHg of suction and 0.55 ounces a minute. BabyGearLab measured them in testing last updated September 9, 2025, at $226. Momcozy’s S9 Pro, Elvie’s Stride 2 and the Medela you’ll actually find at a general retailer have all changed. That happened since any lab weighed in. This comparison is about what that gap is worth to you.
Prices are approximate, current as of publication, and change frequently — confirm the latest price with the retailer before buying.
Why Doesn’t a Breast Pump’s Lab Data Match What’s on the Shelf?
Because three of these four product lines have moved since anyone with a suction gauge checked them. BabyGearLab’s breast pump testing was last updated September 9, 2025. It’s the only instrumented, published measurement of suction and output I could find for this category. Two of the machines it measured have since been replaced by name, and a third has effectively changed sales channel. Here is each one, tested against what’s actually for sale.
| On sale today | Last independently measured | Maker’s current claim | Verdict |
|---|---|---|---|
| Spectra S1 Plus | Spectra S1 Plus — 250 mmHg, 0.55 oz/min (BabyGearLab, Sept. 2025) | Matches the tested unit; no separate claim needed | Current and verified |
| Elvie Stride 2 | Elvie Stride, the predecessor — 170 mmHg, 0.12 oz/min | “Up to -300 mmHg” hospital-grade suction, per Elvie’s own product page | Maker claims nearly double; no independent number found for the Stride 2 itself |
| Momcozy S9 Pro | Momcozy S9, the predecessor — 230 mmHg, 0.20 oz/min, rated “Loud” | None published — the S9 Pro’s spec sheet lists “9 levels” and battery figures, no mmHg or oz/min | Predecessor’s number no longer applies to what’s sold; successor publishes nothing to replace it |
| Medela Pump In Style with MaxFlow, Handsfree (general retail) | Medela Pump In Style with MaxFlow, corded — 160 mmHg, 0.24 oz/min | None published for the Handsfree variant | A differently built product; untested by any lab I could find |
Read that middle column carefully. It isn’t that these pumps got worse, or that anyone lied. It’s that “tested” has an expiration date nobody prints on the box. Three names on this page have quietly outlived their own lab data.
Is the Elvie Stride 2’s claimed suction real?
Elvie’s own product page for the Stride 2 advertises “high maximum pressures from -270mmHg up to -300 mmHg”. That’s across 10 stimulation and 10 expression settings. The Stride it replaced — the one BabyGearLab actually put a gauge on — measured 170 mmHg. If the new number holds up, that’s not a refinement, it’s close to double. I could not find a published independent measurement of the Stride 2 itself. Not from BabyGearLab, and not from anyone else, as of this writing.
What Elvie does publish elsewhere checks out on its own terms: roughly three hours of pumping per charge. It also lists a 5-ounce capacity per cup and six flange sizes in the box. It claims a fit for 99 percent of nipple sizes. None of that is suction, and suction is the number this whole comparison turns on. At $269.99 list — commonly discounted, $202.49 at the time I checked — it’s the most expensive pump here. It’s also the only one whose central performance claim is entirely maker-reported.
Skip this if the claimed suction jump is the reason you’re buying. Nobody outside Elvie has confirmed it yet. You’d be paying the top price on this page for a number with one source.
Where did the Momcozy S9 Pro’s suction number go?
The original S9 has a real lab result: 230 mmHg of suction and 0.20 ounces a minute of output. BabyGearLab also gave it a “Loud” noise rating. The S9 Pro that replaced it publishes none of that. Momcozy’s own spec sheet for the Pro lists two modes and nine intensity levels. It also lists an 8-to-9-session battery life of roughly 270 minutes total. It lists a 30-minute auto shut-off and a noise claim under 45 decibels too. Every one of those is a maker figure, none of them suction or output.
That’s not necessarily a downgrade. It’s possible the Pro pumps harder than the 230 mmHg unit it replaced. It’s also possible it doesn’t. Dropping the number from the spec sheet is a convenient way to avoid finding out in public. Either way, at $119.99 the S9 Pro is the cheapest pump in this comparison by a wide margin. Its battery life — roughly 4.5 hours per charge — beats the Spectra’s and the Elvie’s published 3 hours each.
Skip this if you need to know your suction setting will still work at the flange size. And it needs to work at the pressure your last pump was calibrated to. There’s no published number here to calibrate against.
Why is the Medela BabyGearLab tested now hard to buy at retail?
This is the finding I didn’t expect. BabyGearLab measured the exact corded Pump In Style with MaxFlow at 160 mmHg and 0.24 oz/min. Those are the weakest numbers on that lab’s chart. That exact unit shows as no longer available new at a major electronics retailer I checked. Its remaining listings sit mostly with insurance-focused durable-medical-equipment suppliers rather than ordinary retail shelves, at a list price near $260.
Walk into general retail and the Medela you’ll actually find under the “Pump In Style” name is the Handsfree version. It’s currently listed around $130.99 — roughly half the price and a wearable-adjacent design. I could not find independent suction or output data for it anywhere. It isn’t the machine that got tested. Medela’s own current lineup has also split into Pro, Pro+, and Handsfree variants under the same “Pump In Style” name. That makes it easy to think you’re buying the reviewed pump when you’re buying a sibling product instead.
Skip this if you’re shopping general retail and assuming “Pump In Style” means the pump the reviews describe. Check the exact model name against your insurance supplier’s list before you decide it’s the same machine.
How Do Four Breast Pumps Score on What’s Verifiable?
The Spectra S1 Plus scores highest on this weighted ledger at 81.6. That’s largely because it’s the only pump whose lab-verified numbers still describe the unit sold today. The Medela Pump In Style Handsfree scores lowest at 37.9.
Four axes. Whether independent lab data actually describes the model on sale carries the most weight, at 40 percent. That’s because it’s the entire premise of trusting a spec sheet. Price is 25 percent. Published battery life per charge is 20 percent. That’s since a pump that dies mid-session doesn’t get scored on suction at all. And whether you can buy the exact reviewed unit at ordinary retail today, not through an insurance-only channel. That gets the last 15 percent.
How Is Each Axis Weighted?
| Axis (weight) | Spectra S1 Plus $226 | Momcozy S9 Pro $119.99 | Elvie Stride 2 $269.99 | Medela Pump In Style (Handsfree) $130.99 |
|---|---|---|---|---|
| Verified current-model data (40%) | 100 — exact model, Sept. 2025 lab data | 20 — predecessor’s number doesn’t carry over; successor publishes none | 20 — maker claims nearly 2x the predecessor’s measured figure, unverified | 15 — the tested unit is a different, harder-to-buy product |
| Price, cheapest = 100 (25%) | 53.1 | 100 | 44.4 | 91.6 |
| Published battery life per charge (20%) | 66.7 — ~3 hrs | 100 — ~4.5 hrs across 8–9 sessions | 63.0 — ~3 hrs | 15 — not published anywhere I could verify |
| Buyable as the reviewed unit at general retail (15%) | 100 | 100 | 100 | 40 — the tested corded unit is now largely an insurance-channel item |
| Weighted total | 81.6 | 68.0 | 46.7 | 37.9 |
Disagree with 40 percent on verifiability? Drop it to 15 and split the difference across price and battery. Momcozy then pulls ahead of Spectra on cost alone. That’s a defensible way to shop if you’ve decided a lab result from a discontinued model is better than none. I don’t think it is, which is why the weight sits where it does.
How Much Does Each Breast Pump Cost per Minute of Output?
The Spectra S1 Plus is the only pump here with a verified cost per speed. Its $226 price for 0.55 oz/min works out to $41 per 0.1 ounce-per-minute. That’s a figure nobody can compute yet for the Momcozy S9 Pro, Elvie Stride 2, or Medela Handsfree. None of those publish current output data.
Dollars per 0.1 ounce-per-minute of speed is only shown here where the output number belongs to the machine actually being sold.
| Pump | Price | Verified output | $ per 0.1 oz/min |
|---|---|---|---|
| Spectra S1 Plus | $226 | 0.55 oz/min (current model, verified) | $41 |
| Momcozy S9 Pro | $119.99 | Not published for this model | Not calculable |
| Elvie Stride 2 | $269.99 | Not independently measured for this model | Not calculable |
| Medela Pump In Style, Handsfree | $130.99 | Not published for this model | Not calculable |
Three empty cells is the finding, not a formatting error. For reference only, not a fair comparison. It prices machines nobody is currently selling. The discontinued-configuration Medela worked out to roughly $108 per 0.1 oz/min. The predecessor Momcozy S9 worked out to roughly $60. Neither number describes anything you can buy today, so neither belongs in the table above.
Is either company’s “recall” something to worry about?
Momcozy’s wearable pumps, including the S9, S9 Pro, S12, S12 Pro and M1, appear on a Health Canada recall notice. That notice is dated January 28, 2023. Read the notice itself before reacting to the word: the hazard listed isn’t a burn, fire or suction failure. It’s that the devices were sold in Canada without the required medical device license. Health Canada’s own update on the same notice states a license was issued on May 3, 2023, resolving it. That’s a licensing gap closed more than three years ago, not an open safety recall, and I found no U.S. CPSC recall for Momcozy, Spectra, Elvie or Medela breast pumps as of publication.
Does insurance change any of this?
It’s most of the reason the Medela finding above exists at all. Most U.S. health plans are required to cover a breast pump. That coverage is typically supplied through a durable medical equipment provider rather than sold over the counter. The Department of Labor’s guidance on pump-related workplace rules, revised as recently as January 2026, still points to that requirement. That insurance channel is exactly where the older corded Medela has retreated to. Meanwhile general retail moved on to the Handsfree version. If your plan covers a pump, check your supplier’s exact model name and number against what’s reviewed here. Do this before assuming they match.
So which breast pump should you buy?
The Spectra S1 Plus, at $226, has 250 mmHg of suction and 0.55 ounces a minute. Those are numbers BabyGearLab actually verified. It’s not the cheapest pump here, and it isn’t trying to be. It’s the only pump here where the review’s suction number and the box’s suction number are still the same claim. That claim was checked by someone other than the company that sells it.
The Momcozy S9 Pro is the honest budget pick, not because its performance is proven. It earns that because its price and battery life are real: $119.99 and roughly 4.5 hours between charges. That comes with the explicit understanding that you’re trusting a spec sheet with no lab behind it.
The Elvie Stride 2 is the one to want and the hardest to fully recommend at $269.99. The claimed suction jump is real on paper and unconfirmed everywhere else. And the Medela sitting at the bottom of the tally isn’t a bad machine. It’s a case study in a brand name outliving the specific product it was built on. That makes it the loser here on paperwork rather than on air.
What Should You Do Before Buying a Breast Pump?
Two things to do before you buy any of these. Get the exact model number, not just the brand name, from whoever is selling it to you. Insurance supplier included. Suction may be the number driving your decision. If so, buy the pump somebody other than its own manufacturer has actually measured.
Sources named where they carried the numbers above: BabyGearLab’s instrumented breast pump testing, the U.S. Department of Labor’s guidance on pump-related workplace coverage, and Health Canada’s recall notice on wearable breast pumps. Every price above was checked against a listing in August 2026. The specific retailer or supplier behind each one is named in the section discussing that pump.
The pump is one piece of a larger feeding setup — our baby bottle comparison covers where the milk goes next, the nursing support comparison covers comfort, and the sleep-space comparison covers the rest of the night shift. More in Family & Kids.
