Milk leaks out from the top of the bottle under the connector part during pumping. How can I stop the leaking?

I would suggest contacting the Medela customer service team on 0161 7760400. The fit between the bottle the connector does allow for air to enter the bottle, otherwise the pump would not be able to draw the breastmilk from the breast into the bottle, but this should not cause any issue when pumping.

The pump can be used with an expression bra

Which cup would fit (21 or 24mm) for a D cup size?

Deffo going to need the 24mm. I only use this if will be out and about because it doesn’t empty the breast fully unless you are happy to spend 30 mins on each breast on the highest setting. Get the Ardo hospital grade one for home and a expressing bra. You can thank me later haha

If I put both battery and plug, which power I’m using

If the unit is plugged in, you will be using the mains power

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Swing Flex Single Electric Breast Pump - Compact Design, Featuring PersonalFit Flex Shields and Medela 2-Phase Expression Technology

Swing Flex Single Electric Breast Pump - Compact Design, Featuring PersonalFit Flex Shields and Medela 2-Phase Expression Technology

Product ID: 131280172

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Details

Brand
Medela
Operation mode
Electric
Special feature
Portable
Material
Silicone
Power source
Battery
Included components
Adapter

⚡2-Phase Expression tech for natural rhythm

🎯PersonalFit Flex shields for optimal milk flow

👜Compact & portable design, pump anywhere

Description

🍼 Pump smarter, not harder — because your time and comfort matter.

ON THE GO FREEDOM - Lightweight (40g) and portable with battery or plug operation—pump discreetly anytime, anywhere.
CUSTOM COMFORT FIT - Oval, 360° rotatable PersonalFit Flex shields reduce pressure and boost milk flow tailored to you.
COMPLETE STARTER KIT - Includes two shield sizes, bottle, stand, and quick start guide for hassle-free use from day one.
SWISS PRECISION SAFETY - BPA-free, Swiss-engineered quality trusted by healthcare pros worldwide.
NATURAL RHYTHM MAXIMUM OUTPUT - Mimics baby's instinctive sucking with adjustable vacuum for efficient, comfortable pumping.

The Medela Swing Flex Single Electric Breast Pump combines innovative 2-Phase Expression technology with customizable PersonalFit Flex shields to deliver a natural, comfortable pumping experience. Its compact, lightweight design and battery-powered option make it perfect for busy moms on the move. Engineered in Switzerland and BPA-free, it ensures safety and efficiency, helping you maintain milk supply with ease and style.

Specifications

Model Number	101033793
Product Dimensions	12.5 x 19 x 25.5 cm; 40 g
Item model number	101033793
Target gender	Female
Material Type	Silicone
Material composition	Cotton
Additional product features	Portable
Number of items	1
Style	Single electric: Swing Flex
Power source	Battery Powered
Pump type	Electric
Batteries required	Yes
Battery Type	Can be used with batteries but not included, take 4x AA
Dishwasher safe	No
Is portable	Yes
Item Weight	40 g

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