Perinatal Risk Factors for Postnatal Weight Loss in Late Preterm Infants

Purpose Many studies have reported associations of early postnatal growth failure in preterm infants with several morbidities. However, the risk factors for postnatal weight loss (PWL) in late preterm infants have not been identified. We investigated the independent risk factors for PWL in late preterm infants. Methods This was a retrospective cohort study. We enrolled 369 late preterm infants born at 34+0 to 36+6 weeks gestational age who were admitted to the Soonchunhyang University Cheonan Hospital between 2015 and 2017. PWL% was calculated as (birth weight–lowest weight)/birth weight×100. The infants were classified into lower (