Sorry, it's a postathon day; always happens after a bad night when my confidence goes in the approach we're taking.
DS, nearly 3 wks old, often calms down when patted on the back and often dozes off if held over your shoulder with his back patted. DD also liked it. DS just fell asleep on my shoulder so I started patting his back gently as I walked up the stairs with him to put him in his cot. Put him down, patted his side instead, and he didn't stir much. No idea how long he'll sleep for, but as these things go, that was quite successful!
Just thought I'd share it as a tip as there's so little help I can offer, I'm always asking instead!