Same here. I had difficulty latching on baby so decided to gv express breastmilk and topup with formula. I try my best to pump every 3 hrs, max 4 hrs for 15-20 mins. Impt to keep on schedule so that body will keep on producing milk. I am drinking more milk, milo, nestum. I am also waiting for my order from legendairy to arrive. Its a milk booster supplement, you may check them out. Hope it helps.
Try power pumping
Jo Ann Dela Cruz