The other way I see can see a mother’s milk supply diminishing is if she attempts to express milk and bottle feed rather than by nursing directly. Personally, I found that when I express, I can never extract as much milk as Gavin could if he nursed directly. There would be times when I’d pump until my fingers were sore and nothing would come out. All I had to do was put Gavin on the breast and the milk would start flowing again. In short, there’s simply no better breast pump than your baby.