My 3 week old is and has been extremely gassy for a while now. It interrupts her when she is eating and is honestly the time when she is most fussy, trying to get the gas out. I can feel it rumble in her tummy something horrible

I am breastfeeding with only 2-4 ounces of formula at night to help settle her for bed. I haven't avoided any certain foods except for coffee. My mom mentioned some gas drops that you can buy over the counter called Milicon? Is this a good thing to use? Anyone using it that has noticed a difference?
Re: Extremely Gassy Baby
***make sure the gripe water you buy says that it does NOT have to be refrigerated after opening (some do) that way you can throw it in the diaper bag whenever you need to and you don't have to worry about it.
As far as the gassiness, could def be the formula. It isn't as gentle on their tummies as BM is.