Wagner SM, et al. - By performing this population-based retrospective cohort analysis, researchers compared the composite neonatal as well as maternal adverse consequences in low-risk pregnant women who labor and subsequently deliver at different time shifts. For this purpose, they utilized the US vital statistics data set on Period Linked Birth-Infant Death Data from 2012 to 2016. The study sample was confined to live births from low-risk women with nonanomalous singletons who labored and delivered at 37 0/7 to 41 6/7 weeks of gestation. They classified the time of delivery: the first shift (7:00–15:00), the second shift (15:00–23:00), and the third shift (23:00–7:00). During the study span, there were 19.9 million live births, of those, 58.8% (more than 11.6 million) satisfied the inclusion criteria. A marginally but significantly higher composite neonatal adverse outcome was reported in correlation with the occurrence of delivery at the second (15:00–23:00) and the third (23:00–7:00) shifts vs the first shift (7:00–15:00), among low-risk singleton pregnancies. Among the three distinct time shifts, a similar composite maternal adverse outcome was documented.