Hi. I Am Diva. My Baby Boy Is 4 Months

Hi. I am diva. My baby boy is 4 months old.he is not breastfeeding. We tried in every possible way so am pumping and giving him milk. I do both bm and formula because I have very low milk supply(getting 8 oz a day, pumping 7 times every 3 hrs). I tried all tablets like fenugreek pills, mothers more milk plus, metoclopromide more milk tea nothing seems to be working. Is there any other way to increase my supply. Am really worried because my supply has started reducing now,