How much milk are our august babies drinking?

My son drinks 3 oz every 3 hours (upto 24 oz a day) He was drinking 5oz every 3 hours but has developed really bad colic/reflux and so has dropped his feeds a lot. How much are your little ones drinking? Is it normal to have less milk because of reflux/colic?

Fed expressed 1-2oz and 1-2oz formula.