In reply to johncoxmysteriously:
My wife climbed the Squamish Chief at 7 months, 10 pitches up to E2, the baby came at 8 months, otherwise we would have continued (no, there is no link).
There are common sense unwritten rules, wear a chest harness (because the sit harness had to be looser than you'd normally want), avoid traverses, no arduous approaches, no leading, low commitment, routes you already know.
Other than that, its the perfect pregnancy activity, low impact, less exhausting than walking up a gentle incline for her.
Post edited at 18:39