In the 20th century, obstetrics developed chiefly in the areas of fertility control and the promotion of healthy births. The prenatal care and instruction of pregnant mothers to reduce birth defects and problem deliveries was introduced about 1900 and was thereafter rapidly adopted throughout the world. Beginning with the development of hormonal contraceptive pills in the 1950s, obstetrician-gynecologists have also become increasingly responsible for regulating women’s fertility and fecundity. With the development of amniocentesis, ultrasound, and other methods for the prenatal diagnosis of birth defects, obstetrician-gynecologists have been able to abort defective fetuses and unwanted pregnancies. At the same time, new methods for artificially implanting fertilized embryos within the uterus have enabled obstetrician-gynecologists to help previously infertile couples to have children.
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