I had heard that little baby bicycle legs are terrific for helping relieve gas pressure (and thus saving my ears and tortured heart from listening to the associated crying) but Holden never went for that position. Instead, I do this:

Sit him in my lap facing away (so I’m a big chair on the glider)

Pump his legs (together) 3 sets of 3 long followed by 3 short (almost SOS in Morse code?)

If it works (you know, if he farts!), repeat until nothing a lot more happens