Help with adjusting feeding schedule

My son is 10 months now and still takes 5 6 ounce bottles throughout the day. I know at this point I need to start cutting that down (not the ounces, just the frequency), but I'm not sure how to go about it. His schedule now is this:

Wakes up between 7:30-8am/bottle right away

Breakfast at 9, down for his first nap at 10 where he sleeps anywhere from 11-11:30

Wakes up, bottle. Lunch at 12-12:30pm

Bottle at 1:30 or 2 depending, then down for second nap at 2:30

Bottle when he gets up around 4

Dinner at 5

Bottle at 7-7:30, bed at 8pm

How should I adjust to have less bottles (but obviously the same ounces) through the day?