Hi tazie,
There r a few ways to increase supply.. One, let baby suckle more n longer. I'm firm with my girl n keep her at the breast even though she is angry with the slow flow. Two, pump fter feeding for five minutes. Three, try fenugreek tea or tablets. Four, get Motillium,a drug that helps increasemilk.
But honestly, as long as baby is ptting on weight n have enough wet diapers, your supply is sufficient.so don't worry. I have a baby who is frustrated at the breast when flow is both too slow or too fast. they are just fussy this way.