Final answer:
Complete cervical effacement occurs and expulsion of the neonate begins in stage two of labor.
Step-by-step explanation:
During stage two of labor, complete cervical effacement occurs and expulsion of the neonate begins. In this stage, the cervix is fully dilated to about 10 cm, allowing for the baby to be pushed out from the uterus. This stage is also known as the active phase of labor, where contractions are strong and regular.