Gassy baby

Shelby
My 6 mo had all of a sudden started letting out gas ALL the time. He literally toots out loud 20-30 a day... not counting all of the silent ones! And it's loud and sometimes smelly. But he never acts like he in pain. It's nothing like the gas he had as a newborn where his belly would get super tight. I just can't figure out what is going on with him! His been doing this for about 2 weeks but he's been eating the same for about 6 weeks so it's not like anything has changed! 
Anyone know what it could be?