I always wonder when my DD does the big irritable cry, arch, wriggle then big fart if it's the other way around with the crying etc. causing the fart by straining her tummy and pushing a whole lot of gas out in one go that would otherwise have come out gradually and less noticeably. Just my theory anyway. People talk about the legs up, arched back = wind pain as if it's gospel but we're all really just guessing what babies are feeling.

Unfortunately that doesn't help much in terms of solutions. I end up trying all the regular settling techniques (cuddles, wearing, massage, feeding etc) and my DD eventually calms down and sleeps. Some days I think the settling techniques do as much to help me as her by giving me things to do.