1. Engagement – fetal presenting part as its widest diameter reaches the level of the ischial spine of the pelvis
2. Descent – movement of the bi-parietal diameter of the fetal head downwards until it reaches the pelvic inlet.
3. Flexion – Fetal head reaches the pelvic floor; head bends forward onto chest, presenting the smallest anteroposterior diameter.
4. Internal Rotation – fetus enters pelvic inlet to the maternal pelvis, allows longest fetal head to match the longest maternal pelvic diameter.
5. Extension – Internal rotation is complete, fetal head passes beneath the synthesis pubis while in flexion.
6. External Rotation – allow the shoulders to rotate internally to fit the pelvis.
7. Expulsion – occurs first as the anterior, then the posterior shoulder passes under the symphysis pubis.