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.

Personally I don't think it is the matter of whether which pump yields more milk. Firstly, I think it is important for u to be comfortable with the pump, meaning u don pump till u are bleeding and in pain kind. Secondly, my question is, are u drinking n eating enough to get more yield. I m using manual avent pump and despite what others say, I am v comfortable with the equipment and it gave me more yield than what my boy was drinking. Hence, I feel that it might not be the pump but whether you are consuming enough to generate your supply.