Should i switch formula brands?

I was wondering if anyone has any formula recommendations or if this is normal?....... I had my 2nd baby 5 weeks ago, hes formula fed. The hospital gave him Similac Advance when we stayed in the hospital so thats what hes been using. For a few weeks ive noticed his farts started smelling like a grown mans farts. 💀 like a huge dump and rotten eggs. Sorry TMI its enough to stink up my bed room! Sometimes his farts trick me thinking its poop. I'm wondering if his formula could be causing this. I also had to buy gripe water and gas drops for him at 3 weeks old because he was so fussy and couldn't get comfortable. I could be holding him and hear and feel his gas moving in his stomach. He poops every other day or every two days. I think want to call his dr but im not sure if this is something that's normal and im over thinking it (ive called so many times already lol I feel like id be bugging) My 1st born never had these problems.