I have very difficulty to produce breast milk. I produce only 4 oz a day. Almost give up, can anyone give me advice on how to increase quantity?

The emptier your breasts are, the more milk they will produce. Frequent latching or pumping will help to stimulate production. Try to relax, as stress also inhibits milk production. Massage your breasts when you are pumping or latching to get more milk. You can also consume more milk boosters. http://sg.theasianparent.com/how-to-increase-breast-milk-supply/