Should I be concerned? Burping problems

My LO has became difficult to burp lately. He is 10 weeks, and I usually sit him onmy leg and I’ll lean him over and pat his back. For the past several days he refuses to sit and like, stretches his legs out to stand...I have tried laying him down to burp and over the shoulder, but when I do he arches his back. This happen to anyone else? Any other thoughts on how to burp? I have him leaning up against my arm in his little standing pose just to keep him up right because idk what to do