1. Flange/insert size: Use the Nipple Measurement Card (included) to select the right insert size. If using 19mm on S1, start with 19mm on S2. The right fit significantly affects output.

2. Re-check assembly: all five pieces (duckbill valve, milk container, flange, diaphragm, and pump motor) must be perfectly sealed.

3.Suction settings: Try different suctions and rhythms. Max Flow targets highest output; Natural Flow mirrors a baby's rhythm.

4. DIY mode: Experiment with custom sessions — adding a brief rest mid-session has helped some users get more output.

5. Allow adaptation: Output typically improves after 3-5 sessions with a new pump.

If you have any other questions, please don't hesitate to contact eufy Support Engineers for further assistance.