Feeding

How much are you feeding your LO? When should the amount be increased? My LO is 10 weeks and he eats 4 oz every 2 to 3 hours.. Sometimes he doesn't finish the entire bottle and he typically goes 2.5 hours between feedings. He does sleep thru the night and has been doing that since about 6 weeks.... He sleeps from about 8:30 or 9 to 6am. When he wakes up at 6 we give him 6 ounces which he always finishes. Opinions? I'm not sure when I should increase his amount...