Childbirth is a difficult & dangerous step, but each time your daughter asks you about it, you must answer that it will be fine, that we are made for it. The way the mother talks about childbirth is decisive in the vision of childbirth of the daughter, & therefore of its outcome.
About Childbirth, I recommend the books by Michel Odent (many in English), and this film (which is not perfect at all, but interesting):
Patrimonialis Weistum 