Spitting up hours after a feed?

My son is almost 7 weeks and for the past few weeks now he’s been spitting up 1-2 hours after his feed. It’s more of like it dribbles out of his mouth, it’s not forceful and it doesn’t upset him. After a feed I try and keep him upright at least 15 minutes but it happens even in an elevated position like in the bouncer or swing. He’s eating 4 oz and I would say what dribbles out is about half an ounce or less and it’s not all the time but at least 3 times a day. He’s a great burper too, I usually burp after every 2 ounces but still hours later it’ll drool out the side of his mouth. I never had this issue with my first son. Just wondering if anyone is experiencing the same.