How to Use a Wearable Breast Pump – Step-by-Step Guide

New to wearable breast pumps? This guide walks you through how to use a wearable breast pump for the first time, including setup, pumping session tips, and cleaning advice for Yuemi S12 and S21 users.

Before Your First Use

1. Wash your hands and all pump parts that will contact your skin or milk.
2. Charge the pump fully using the included USB-C cable (approximately 2 hours).
3. Choose the correct flange size for your nipple (included sizes: 21mm, 24mm, 27mm).
4. Assemble the pump: connect the flange, valve, diaphragm, and milk container.

How to Wear the Pump

1. Put on a comfortable nursing bra.
2. Center your nipple in the flange opening.
3. Slide the assembled pump inside your bra cup.
4. Ensure a snug, comfortable fit with no gaps around the flange edge.

Starting a Pumping Session

1. Press the power button to turn on the pump.
2. Start in the massage/stimulation mode to trigger letdown.
3. After 1–2 minutes, switch to expression mode and select your preferred suction level.
4. Pump for 15–20 minutes or until milk flow slows significantly.
5. Press the power button to stop. Remove the pump and pour milk into a storage container.

Tips for Best Results

• Pump 8–12 times per day (or every 2–3 hours) if exclusively pumping.
• Stay hydrated and relaxed during pumping sessions.
• Use a hands-free pumping bra for maximum comfort and mobility.
• Store breast milk in approved storage bags within 4 hours at room temperature.

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