In reply to PDL:
My first was by Caesarian and I was told not to climb or drive for six weeks (or was it three months; I can't remember now)
Anyway, whatever it was it was intolerable, and two weeks after the birth I was at my local wall, climbing carefully and responsibly, and driving too.
However, there were lots of times when the baby was young when I seriously suffered from adrenaline deprivation. So what I did (I know this is weird) is navigation practise in the woods in the dark. I recommend that as wildly exciting and vaguely relevant to climbing.