Grunting all night

Ana

So my almost 2 week old does this primary only in the 2nd half of the night like 2 am he starts grunting and after a bit he'll cry. It's hard to get him to calm down and stop. It's loud enough to wake up and I haven't gotten good sleep in a couple days now. Idk if it's reflux since it only happens at a particular time. He grunts durning the day but after a few grunts he stops. Anyone have this? Had success stopping it?