Coolman: Lost credit card took 500 mg zoloft Premature birth is the leading cause of infant mortality in the United States, and accounts for 35 percent of health care spending for infants In the U.S., nearly one in three births is by Cesarean section. The two are related: Inducing labor with drugs can put a woman on a track toward a C-section. In a 2003 study of 14,000 women, induced labor was associated with an increase in C-section rate from about 14 percent among women whose labor started spontaneously to nearly 25 percent among women whose labor was induced.