Quoting mommommommyma:" My new one just will not burp! He will eat a whole 2 ounce bottle at a time and nothing, I pat his back for 20 mins at a time, tried putting him on his belly,sat him in my lap and nothing. Any tricks?"
Sit him on your knee, support his head with your hand under his chin, and bounce your knee up and down - strong enough so he gets a little bump as your foot hits the ground each time. That usually worked for us. Also, sometimes there is just no burp! So don't stress too much.