Objectives: To prepare more accurate population-based Australian birthweight centile charts by using the most recent population data available and by excluding pre-term deliveries by obstetric intervention of small for gestational age babies.
Design: Population-based retrospective observational study.
Setting: Australian Institute of Health and Welfare National Perinatal Data Collection.
Introduction: Birth weight reference charts based on historical infant birth weights have significant bias at preterm gestations because many preterm births are associated with abnormal growth. This study aims to determine whether more accurate birth weight charts can be constructed using data only from births that follow spontaneous onset of labour.
Materials And Methods: This study was a single-centre retrospective observational study of 115,712 singleton live births.