Obstetrics (from the Latin obstare, "to stand by") is the surgical specialty dealing with the care of a woman and her offspring during pregnancy, childbirth and the puerperium (the period shortly after birth). Midwifery is the equivalent non-surgical specialty. Most Obstetricians are also gynaecologists.

The average gestational period for humans is 40 weeks by gestational age and 38 weeks by fertilization age. This is divided into three trimesters.

Midwifery is the term traditionally used to describe the art of assisting a woman through childbirth. In the modern context, this term is used to describe the activities of those health care providers who are experts in women's health care including giving prenatal care to expecting mothers. They attend the birth of the infant and provide postpartum care to the mother and her infant. Practitioners of midwifery are known as midwives, a term used in reference to both women and men (the term means "with woman").

Midwives are autonomous practitioners who are specialists in normal pregnancy, childbirth and the postpartum. They generally strive to help women have a healthy pregnancy and natural birth experience. Midwives are also primary care givers providing general women's health care. Midwives are trained to recognize and deal with deviations from the norm. Obstetricians, in contrast, are specialists in illness related to childbearing and in surgery. The two professions can be complementary, but often are at odds because Obstetricians are taught to "actively manage" labor, while midwives are taught not to intervene unless necessary.

Midwives refer to Obstetricians when a woman requires care beyond her or his areas of expertise. In many jurisdictions, these professions work together to provide care to childbearing women. In others, only the midwife is available to provide care. Midwives are trained to handle certain situations that are considered abnormal, including breech birth and posterior position, using non-invasive techniques. In many areas of the world midwives are the only available providers for childbearing women

A midwife may practice in any setting including in the home, the community, hospitals, clinics or health units.

Historically, midwifery has been one of the few medical practices dominated by female practitioners. From Agnodice in ancient Greece to the 18th century in Europe, the care of mothers and delivery of infants has been regarded, both by patients and by the medical profession, as appropriately carried out by women.

Nurse-midwives

Nurse-midwives were introduced in the United States in 1925. This combination of nurse and midwife was very successful. The Metropolitan Life Insurance Company studied the first seven years of the FNS, and reported a substantially lower maternal and infant mortality rate than for the rest of the country. The report concluded that if this type of care was available to other women in the USA thousands of lives would be saved, and suggested nurse-midwife training should be done in the USA.