How does woman’s preconceived idea of childbirth as painful, inhibit her experience and affect the baby’s experience of birth?

Belief controls biology via the emotions. i.e. when a woman believes that childbirth will be painful then the emotion of fear is triggered and it is the fear that alters the physiology as described above. Contemporary science demonstrates that the mother communicates with her baby biochemically. The same hormones that are released in the mother’s body by her fearful belief system (adrenaline) crosses the placenta and stimulates a similar response in the baby.