Im also on exclusive pumping! Gave up latching after 3 weeks due to poor latch and LO always seem hungry. I up my supply initially by keeping my pumping to every 2-3hrs and taking supplements (fenugreek pill, lactaction bakes). Now i produce enough for my LO to be on full EBM.
The key is not to overpump. I use medela freestyle (double pump), keeping pumping to 15 to 20mins each time only at moderate pressure. If pump too long and high suction it may cause your breast to sore and backfire instead. Important to stay relaxed during pump(watch netflix!) and stay well hydrated!
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