Pre-delivery BMI and the Accuracy of Fetal Weight Estimation in Very Preterm Infants.

Objectives: To examine the relation between maternal pre-delivery BMI and the accuracy of sonographic estimated fetal weight (EFW) in very preterm infants (<32 weeks gestation).

Methods: This retrospective study included singleton infants born between January 2010 and March 2023, at gestational ages 23 to 31 weeks, at a tertiary university-affiliated hospital. Absolute weight, percentage error, absolute percentage error, and overestimation and underestimation of EFW were compared between women with pre-delivery normal weight (BMI 18.