Pushing during Labor and Delivery (IMAGE) Washington University in St. Louis Caption Alison Cahill, MD, an associate professor of obstetrics and gynecology at Washington University School of Medicine in St. Louis, talks with patient Kaylee Prestien at Barnes-Jewish Hospital. Cahill led a national study of 2,400 first-time pregnant women. The research showed that the timing of pushing has no effect on whether women deliver vaginally or by C-section. Credit Matt Miller/Washington University Usage Restrictions Please credit Washington University License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.