Hehehe... My baby farts a lot too when he was young. He doesn't like to burp but prefers to fart. It's good that they're expelling the gas if not it will be painful for them. As long as the fart and poo is not causing any red and sore bottoms, it should be ok. Even if you use Ru Yi oil, their bodies still need to get rid of the air either by farting or burping.
So I feel that it's normal.