DS is 8 weeks and formula fed. He's on infant gaviscon for reflux.
He was always pretty straightforward to burp. I'd feed roughly an ounce and then burp, wind would come up pretty easily and we'd return to feeding. In about the last week that has changed, he just won't burp! Neither me nor DH can get wind up easily any more, we've done over the shoulder and sitting up on our knee. He does eventually burp (after 20 mins or so) so it's definitely in there. The issue is coupled with his reflux if we can't get wind out of him he's often sick and looses a lot of his feed.
Does anyone have any tips, is this normal? Has something developed in some way that means I should change what I'm doing?