my son is 10 weeks old and i've been exclusively pumping since day one because he was in the NICU for a congenital heart defect and had. open heart surgery. he's on a high calorie diet so i can't breastfeed. i have to fortify my breastmilk. any suggestions on how to increase milk production? i only get 1-2 ounces a day! it has decreased from 6-7 ounces a day. so frustrated!