Does Doctor brown bottle really effective for removing gas as it claim? I got a fussy baby which I am having a hard time to feed each time due to too many gas

i used dr brown bottles (120ml) since birth and my LO has never had an issue with burping and drinking milk, and til now 3mths only spit milk once, now he is having using tommie tippie (a gift) as i have upgraded the capacity of his vol thus changed to a bigger milk bottle