Alongside her work as a facilitator, futurist, and author, adrienne maree brown (about whom I wrote more here) is also a birth doula, for babies. In Emergent Strategy she writes:
Birthwork teaches us to engage tension, but not to indulge drama. It is another form of facilitation, making the miraculous experience of birth as easy as possible, intervening with any systems that make the process harder, helping the family attend to each other and listen to what the body is saying, staying focused on the possibility and wisdom of the body. Standing or sitting with someone as they realize, remember their own wholeness–that is the work of the healer and the doula.
Also mostly true of Book Doula work.