Which breast pump will help yield more for milk supply?spectra seems to be raving among many mummies?Are they really good?currently I'm using medela pis but I can only pump about 40 ml per side.

I used Pigeon, Medela freestyle before. Currently Spectra S2. Amongst these 3, Spectra gives me a better yield. It is able to empty my breasts. However, many factors do contribute to whether yield will be good. The food you consume, sufficient liquid intake, sufficient rest and also whether the flange size is correct. Also whether you are comfortable with the pump that you are using. The best pump is still our own child=)