Too much spit up?

Ranise • Baby blue

Okay I'm a new mom. And I'm completely alarmed by how much spit up is coming out of my son. I mean he literally makes a puddle under himself and it all comes out in one big gush. Is it normal??? I mean seriously it looks like he peed but i check his diaper and he's fine. He literally drenches his mattress. He's not fussy after hes actually pretty calm so am I just overreacting?? He's 2wks old BTW.