Any of the systems (e.g., the Lamaze method) of managing birth without drugs or surgery. All begin with classes to teach pregnant women about the birth process, including when to push and what breathing and relaxation techniques to use at which stage. The goal is to reduce fear and muscle tension, which can increase the pain of labour, and to make the mother an active participant in the process. The father or another partner usually attends the classes with the mother and coaches her during the birth. Seealso midwifery; obstetrics and gynecology.

Learn more about natural childbirth with a free trial on Britannica.com.

Process of bringing forth a child from the uterus, ending pregnancy. It has three stages. In dilation, uterine contractions lasting about 40 seconds begin 20–30 minutes apart and progress to severe labour pains about every 3 minutes. The opening of the cervix widens as contractions push the fetus. Dilation averages 13–14 hours in first-time mothers, less if a woman has had previous babies. When the cervix dilates fully, expulsion begins. The “water” (amniotic sac) breaks (if it has not already), and the woman may actively push. Expulsion lasts 1–2 hours or less. Normally, the baby's head emerges first; other positions make birth more difficult and risky. In the third stage, the placenta is expelled, usually within 15 minutes. Within six to eight weeks, the mother's reproductive system returns to nearly the prepregnancy state. Seealso cesarean section; lactation; midwifery; miscarriage; natural childbirth; obstetrics and gynecology; premature birth.

Learn more about parturition with a free trial on Britannica.com.