Exposure to a widely used herbicide during the middle months of pregnancy may increase the chance of giving birth too early, before 37 weeks, a new study shows. Preterm birth is a leading cause of illness and death in newborns, and premature babies face higher risks of breathing problems, infections, and long-term learning and developmental challenges. Published online July 14 in the journal Environmental Pollution, the new work is among the largest study to date examining glyphosate exposure during pregnancy and preterm birth in humans. Their statistical models also considered other factors that can affect preterm birth risk, such as age, past experiences during pregnancy, and education. The researchers next plan to examine the mechanisms through which glyphosate exposure may affect fetal development and birth.