Transition is the most difficult phase of labor, and fortunately, the shortest, lasting from 30 minutes to two hours. The cervix is opening the last few centimeters, from 7 to 10 centimeters. The pain may be intense, as the cervix stretches and the baby descends into the birth canal. All of your energy is concentrated on doing the work of labor. Try to remain calm and focused as your uterus works. At the end of transition, you may feel a strong urge to push the baby out. The baby is ready to be born.