Background The effects of maternal antenatal corticosteroid (ACS) treatment, for fetal maturation, on the short-term outcome of late preterm infants are unclear. Methods This is a retrospective cohort study conducted in the Second Affiliated Hospital of Shantou University Medical College. Data of pregnant women who gave birth between 34 (0/7) to 36 (6/7) weeks gestation from January 2014 to June 2019 were collected. Nine short-term outcomes of preterm infants from mothers who received ACS treatment were compared to preterm infants from mothers who did not receive ACS treatment. Results In total, 1393 pregnant women (of whom 757 accepted ACS treatment before delivery) and 1472 preterm infants were eligible for analysis. The results were as follows: (1) ACS administration to pregnant women at high risk for giving birth between 34 (0/7) to 36 (6/7) weeks pregnancy , was related to decreasing cost and infant inpatient time (slope was -0.784, P =0.026 and slope was -933.173, P =0.001, respectively); (2) lack of maternal ACS treatment was an independent risk factor for neonatal respiratory distress syndrome (RR=0.548, 95%CI=0.332~0.906); (3) use of maternal ACS did not increase risk of neonatal pneumonia, neonatal hypoglycemia, neonatal sepsis, necrotizing enterocolitis of newborns, neonatal intracranial hemorrhage, and hypoxic-ischemic encephalopathy in preterm infants. Conclusions Use of ACS for pregnant women at risk for giving birth between 34 (0/7) to 36 (6/7) weeks pregnancy may have more advantages than disadvantages. Our study provides evidence-based medicine for clinicians to make ACS treatment choices for pregnant women with risk of giving birth between 34 (0/7) to 36(6/7) weeks gestation.