By the time your baby is one month old, he will probably take 90-120ml / 3 or 4oz at each feed, and will consume anywhere from 400-800ml / 14 to 28oz in one day. You'll soon sense if your baby needs more - he'll finish the feed quickly and then look around for second helpings!
From the age of two months up to six months, you should be feeding your baby 120-180ml / 4-6oz at a feeding, and he'll have anything from 700ml to over a litre / 23 to 35oz a day.
Once your baby reaches six months, you can feed him anywhere from 180-220 ml / 6-8oz at a feeding, and his total formula intake should be roughly 900ml / 32oz per day.