Objective
Edited by: Sijia Lu, Yikon Genomics, ChinaReviewed by: Keiichi Matsubara, Ehime University, Japan; Yanyong Yang, Second Military Medical University, China†These authors have contributed equally to this workThe aim of the study is to assess the effect of maternal prolonged oxygen exposure during labor on fetal acid–base status, fetal heart rate tracings, and umbilical cord arterial metabolites.