how much is your 4month old drinking?

I was mainly pumping the first couple of months because my son couldn't latch. He was drinking 5oz every 3-4 hrs. He's a big guy he's only 4 months and is at 23 lbs now. He's learned to suck from the breast now but is on there for about 5 min or less. He does seem to drink often I suppose. Is he still getting enough and getting what he needs? Also, how much does your baby drink at 4 months?