Loud sleeper

My little guy is 3 weeks and is trying to sleep through the night. The first lay down he sleeps about 2 1/2 hours which is great, after a feeding he sleeps then wakes me up after about an hour and a half with loud sounds. He's sounds like he is choking and having trouble swallowing. His eyes are closed but he's not sleeping sound. I usually grab him and let him sleep on my chest. I'm worried I'm getting into a bad routine. How are everyone else's little ones sleeping? I keep reading about babies sleeping all night and getting jealous.