According to the analysis of National Institute of Health researchers, pregnant women today have longer labors than women did 50 years ago. First-time mothers had an average of 2.6 hours added time during labor as compared to women who only had 4 hours of labor, 50 years ago. Also, women who had multiple labors also had increased labor time by an average of 2 hours.
Researchers found that longer labors today were primarily due to changes in the delivery practices used today.
This was published online in the American Journal of Obstetrics and Gynecology.