tips to get baby to eat all in one sitting?

So for the first couple of weeks, my LO would eat for however long he needed, burp, then sleep for 2+ hours. Now he's 8 weeks and I've been sitting in the same position for 4 hours. He eats, falls asleep, wakes up, uses boob as a soother, falls back to sleep, wakes up and eats... I can't put him down cause he fusses for the boob. Any tips for getting a better pattern? At night he is on a normal schedule. Eats then sleeps for 2 hours but all day it's like this.