Actually my therapist stated that not every person with Pelvic Floor can be treated with Kegel exercises. It is more complicated than that and there are lots of different therapies and exercises specifically for Pelvic Floor. Kegel's are not recommended for my specific issue.
Although a lot of people do experience prolapse, etc. after having a baby, it is not specific to childbirth or complications after childbirth. It appears that Ireland and Australia are a lot further with this condition, but what they are discovering is that it, and treating it properly can sometimes be the cause of incontinence.