Can anyone recommend something for gas pain in infants?

My baby (5 weeks) has has a hard time passing gas. I thought he was constipated but he's poops are still liquidy and he's breastfeed. So he shouldn't be constipated. breast milk is also a natural laxatives, or so I've been told, so I don't know what to do.

He crys and stretches himself out and then curls into a ball and it looks like it's painful for him. He does this til he farts and then he calms right down.

We always burp him after he's done breastfeeding.

FTM here and I'm at a loss. I don't know what to do to avoid the gas pains but I don't know what to do help him with it when he does have it.