Babies need to burp after eating.
Often they are swallowing air when they breast or bottle feed. You can hear them gulping fluid and air. Fussy eaters may need to burp every couple ounces. In general after a baby eats, burp him/her. Some will burp every time and others will not. You can also lay the baby on his/her tummy after eating and the gentle pressure helps push the burp out.