Because its a baby..
Babies all have gas issues.
Some more than others, but gassy in general. Think of it this way. Babies can't walk or talk right away and we dont expect that. So why do we expect them to be expert poopers, farters and burpers? They know they dont like gas, but they dont know what to do about it. Every day feels like being in a car and having to pee with the next exit in 20 minutes. Fussiness