Maternal positioning during labor affects many aspects of the anatomy and physiology adaptations needed to influence all aspects of labor including powers, passage, passenger and psyche. upright and mobile positions , use gravity to aid descent of the fetal head into the pelvis, as the head is applied directly and evenly on the cervix, uterine contractions are intensified in strength, regularity and frequency, as effective contractions are vital to aid cervical dilatation and fetal descent, they have an important role in helping to reduce dystocia (slow progress in labor).