Every newborn and infant (and parent), has gas. For babies, gas is more common because of how babies cry and eat. Breast or bottle, newborns and infants swallow a lot of air with each meal. Gulping milk swallows air as well as milk. And, what infant has never cried? None. When an infant cries they take a gasping breath in after a stretch of wailing. Each breath in leads to swallowing a rather large amount of air. If you add up the air swallowed when eating and crying, babies pump a prodigious amount of air into their stomachs.
That air can only leave the gut in two ways, by burp or by passing. Air is not absorbed from the gut, so a pint of air swallowed can only be burped or passed. Either way works well and is safe. But what this all means is that if your baby burps or passes lots of gas it only means they have swallowed a lot, which is always OK.