Interesting question Audax!

Birth plan for DS1 was the "normal" BB stuff: no drugs, no interventions unless all options explore and I was booked in with the birth centre. DS1 was a good birth - though had an vacuum as he was posterior with his hand up beside his face. Not a lot changed in the birth plan between DS1 and DS2, except for a few tweaks. I came to know what I liked and didn't like in labour and so was able to add that to the birth plan.

Changes to birth plan between DS1 and DS2:
- no canula unless it is an actual emergency (they put a "just in case" canula in and said they needed to give me fluids - but I would have preferred to have been told to have a drink!)
- more direction from the midwives in suggesting positioning and breathing
- no ARM (my one regret from DS1's birth is that our lovely pro natural birth centre MW suggested and did an ARM when I was fully dilated and I think I trusted her judgement a little too much and she did it but DS1 was still posterior and then couldn't turn)

Also, I had a lot of discussions with DH (who was a great support person) about minor things I wanted him to do as I might not remember:
- making sure I had lots to drink
- talking for me (i don't like to talk when sick or in pain)
- ensuring he understand how VITAL it was that I have the TENS machine on - I got very cranky when he didn't get it on fast enough when i said I wanted it.
- of course knowing the birth plan and being ready to stick up for me