1 month old❤

Ftm here☺ my son is 1 month old and he such a strong big healthy baby boy but hes having some problems with gas.. Im calling the pediatrician tomorrow to make an appointment because its getting to be too much i feel.. He loves to eat and he was up to 4 and 5 ounce bottles but for the last week and a half hes been uncomfortable and in pain when trying to pass gas ... We started off with similac pro advanced but we switched to gerber gentle and he was doing betyer with the gerber up until 1 week and a half ago now hes just in pain we use gas drops and gripe water with every feed like the pediatrician said and hes still in pain i have a feeling its the formula .. Does anyone use gerber soothe pro im going to ask before switching to that ?