1. Head of infant pushes against cervix
2. Nerve impulses travel from cervix to hypothalamus in brain
3. Hypothalamus sends hormone oxytocin to pituitary gland
4. Pituitary gland secretes oxytocin into bloodstream
5. Oxytocin stimulates uterine contractions
6. Uterine contractions push baby harder against cervix
7. Cervix starts to dilate
8. Increasing oxytocin, stronger contractions, wider cervix dilation
9. Baby pushed through birth canal and out of body
10. Cervix no longer stimulated to send nerve impulses to brain