If you have narrowed your breast pump search down to Spectra and are now trying to choose between the S2 and the 9 Plus, you are asking the right question. Both pumps are popular insurance-covered options from the same trusted brand, but they serve different types of pumping moms. Here is a clear breakdown of what sets them apart so you can make the right call for your routine.
The Spectra Brand
Spectra is a South Korean medical device company known for producing closed-system double electric breast pumps that are widely recommended by lactation consultants. Their pumps are celebrated for quiet motors, customizable settings, and reliable performance. Both the S2 and the 9 Plus are available through insurance via Storkpump, and many moms qualify with little to no out-of-pocket cost.
The Core Difference: Power vs Portability
The S2 is a plug-in double electric pump designed for moms who pump primarily at home or in a location with reliable outlet access. It is larger and heavier than the 9 Plus, but it delivers a stronger, more consistent suction as a result. The 9 Plus is Spectra's most compact and portable model, with a built-in rechargeable battery that makes it fully cordless. It is light enough to clip to clothing or carry in a small bag, making it the most travel-friendly pump in the Spectra lineup. The tradeoff is that the 9 Plus has a slightly smaller motor than the S2, which some moms notice in terms of output, particularly at lower suction settings.
Suction and Performance
The S2 delivers suction up to 270 mmHg, while the 9 Plus reaches up to 260 mmHg. In practical terms, most moms will not notice a significant difference in output between the two when fit and technique are optimized. However, moms who are exclusively pumping, working to establish supply, or who have found they respond better to higher suction levels may get more consistent results from the S2. For moms who pump occasionally or who have a well-established supply, the 9 Plus performs well and the portability benefit is meaningful.
Shared Features
Both pumps use the same two-phase pumping approach with adjustable let-down and expression modes, independent cycle speed and vacuum strength controls, a quiet motor, a closed system that prevents backflow, a built-in LED night light, and compatibility with the same Spectra flanges and accessories. Whichever model you choose, confirming your flange size is one of the most impactful steps you can take for comfort and output. Use the Storkpump Flange Sizing Guide before your first session.
Insurance Coverage
The Spectra S2 is one of the most widely fully covered pumps across major insurance plans, including many Medicaid plans. The 9 Plus is also covered by many plans, sometimes at no cost and sometimes as an upgrade option. Browse Medicaid-covered pumps here or view the full Spectra collection on Storkpump to see what your plan covers. The Storkpump team verifies your benefits and walks you through your options, check the FAQ page for details.
Which Spectra Pump Should You Choose?
If you are planning to pump regularly, are exclusively pumping, or are focused on establishing supply in the early weeks, the S2 is the stronger choice for reliable, powerful performance at home. If portability is your top priority and you want the freedom to pump without being near an outlet, the 9 Plus is a well-built, capable option. For more guidance on choosing between Spectra models or comparing Spectra to other brands, visit the Storkpump Learning Center.
Frequently Asked Questions
Can I use the same accessories for the S2 and the 9 Plus?
Yes. The S2 and 9 Plus use the same Spectra flanges, tubing, valves, and collection bottles. Accessories are fully interchangeable between Spectra models, which is helpful if you own both or decide to switch.
Is the Spectra 9 Plus good for exclusive pumping?
It can work for exclusive pumping, particularly for moms with well-established supply. However, many exclusive pumpers find the S2 or S1 more reliable for the frequency and duration required. If you are planning to exclusively pump from the start, the stronger suction of the S2 is generally the safer choice.
How long does the Spectra 9 Plus battery last?
The 9 Plus battery lasts approximately 3 hours of pumping time on a full charge, which covers several pumping sessions throughout a workday. Charging between sessions when possible helps ensure you always have a full battery available.
Does the Spectra 9 Plus have the same let-down mode as the S2?
Yes. Both pumps have the same two-phase design with a massage mode for let-down and an expression mode for milk removal, along with independently adjustable cycle speed and suction strength. The pumping experience is functionally the same on both models once you are in a session.
Sources
- Academy of Breastfeeding Medicine Protocol Committee. (2021). ABM Clinical Protocol #35: Supporting breastfeeding during maternal or child hospitalization. Breastfeeding Medicine. https://www.bfmed.org/assets/ABM%20protocol%2035%20Nov%202021.pdf
- U.S. Food and Drug Administration. Breast pumps. https://www.fda.gov/medical-devices/consumer-products/breast-pumps
- Centers for Disease Control and Prevention. (2026). About breastfeeding. https://www.cdc.gov/breastfeeding/php/about/index.html
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