Fussy baby

So I have a fussy baby, he is 6 weeks old and he keeps crying I've changed him , we walked around, I grabbed him. Burped him, and he keeps feeding a lot , and sputters some, and wants to eat more and more. He hasn't fully slept , less than 2 hours since we woke up in the morning at 11am .

What could it be? Anything I can do.