A friend of mine got married recently and had a CF wedding, but 'bent the rules' for another friend (who I didn't know) who had a newborn, having assured her it would be no bother.
(NB - newly-married friend and I are both CFBC and in our early 40s with no real experience of children, so as not to drip-feed.)
The 'no bother' was a fucking MASSIVE bother - my OH was an usher and he was running around like a blue-arsed fly ten minutes before the ceremony to accommodate the chilled couple, who had failed to mention they'd be turning up with a pram the size of a Sherman tank and enough bags and accoutrements to run a first-world country for a week, thereby requiring the set-up of the small room (initially laid out to accommodate 20 adults) to be rearranged.
The BF mother then asked for her meal to be changed from omni to vegan (there were no other vegans attending, just a couple of veggies) as the baby was colicky and she had cut all dairy etc from her diet. The venue did a good job in the circumstances, but she then complained that her meal wasn't as good as everybody else's.
They then made a massive fuss at the (small and not exactly Vegas-esque) reception, as the little corner my friend had set up for them was apparently 'too brightly lit'.
Ironically, the two-month-old sprog was pretty good, all things considered.