I can’t say how many mothers experience such a thing, but I was asked to be there at a birth to sort of hold a young mother’s hand (English was not her native tongue and she was from another culture). Her birth was horribly mismanaged by her doctor and she received a tear all the way into her rectum. I suppose that’s about as bad as it gets. You don’t want to go through that again, that’s for sure. It’s a pity, because it didn’t HAVE to happen.