Final answer:
Stage II is the stage of labor in which the baby is born, following the cervical dilation in Stage I and preceding the delivery of the placenta in Stage III.
Step-by-step explanation:
During the childbirth process, there are three distinct stages. The second stage, referred to as Stage II, is the critical phase wherein the baby is born. This stage follows Stage I, which involves the thinning and dilation of the cervix, generally to about 10 cm to allow for the baby's passage. Once fully dilated, Stage II begins with the baby being expelled from the uterus. This typically involves contractions of the uterus and the person giving birth actively pushing to help the baby move through the birth canal. The third and final stage is Stage III, wherein the delivery of the afterbirth occurs. This includes the detachment and expulsion of the placenta and other fetal membranes from the uterine wall after the baby has already been born.