When a woman goes into natural labour, her baby initiates labour. Thus when the baby is “ready”, contractions start and they will stronger and longer as time goes on. If the baby is finding it difficult, labour will slow or even stop as in posterior presentations. Baby is using the contractions to turn and get in a good position. During each contraction, the long muscle bands running vertically pull the cervix up as the strong mass of muscles at the top of the uterus push down. The horizontal muscle tightens but just a bit to make sure baby is aligned properly and help the baby to move down. As labour progresses, the mass of the muscle of the fundus gets thicker because it is pulling up the cervix and away from the birth canal while the baby is moving lower. The baby moves faster to two or three stations (from above the level of Ischial spine, -2 station, -1 station; when the presenting part is at the level of Ischial spine,0 station ; when the presenting part below the level of Ischial spine; +1 station and +2 station) quickly after the cervix is dilated.