Childbirth, also known as labour and delivery, is the ending of a pregnancy by one or more babies leaving a woman's uterus. Deliveries are assisted by a number of professions include: obstetricians, family physicians and midwives. Labor happens in three stages in the maternity section of hospitals. The first stage of baby delivery begins with contractions. It continues until your cervix has become thinner and dilated (stretched) to about 4 inches wide. The second stage is the active stage, in which you begin to push downward. Crowning is when your baby's scalp comes into view. Shortly afterward, your baby is born. In the third stage, you deliver the placenta. The placenta is the organ that supplied food and oxygen to your baby during pregnancy. Contractions during this phase are usually intense, spaced about one to three minutes apart. Increasing fatigue, shakiness, and nausea are all common in this phase, as your body does the hard work of reaching complete dilation and effacement. You may feel a strong urge to push or bear down, along with pressure in the rectal area and stinging in the vaginal area as the baby's head moves down toward the vaginal opening. Mothers and babies are monitored closely during Childbirth treatment. Most women are able to have a baby through normal vaginal delivery. If there are complications, the baby may need to be delivered surgically by a Cesarean section.