My baby wont burp?

alondra

He only drank half an ounce i tried burping him for the past HOUR and nothing he fell asleep so i layed him. He had drank 2 ounces a few min vefore and he burped but after this half ounce i got nothing. Do i have to burp him even if he just drank half an ounce its been one hour and nothing im confused? (Hes 2 weeks old)