I've mixed fed my 23 week old son from birth, solely pumping at beginning as he was premature but couldn't pump enough to feed him exclusively. He doesn't have much patience to feed on breast except in the mornings. He has refused my right breast for months. I can't pump as much now as his naps are short & I need to work when I can. Is there anything that helps increase supply & letdown? Google says to pump at least 10 times a day and while I'd love to if it worked, I just dont have the time. Any tips appreciated, thanks.