Objective: To estimate the difference in first-recorded weight associated with deferred cord clamping (DCC) among very preterm infants (< 32 weeks gestational age) using real-world NICU data Study Design: Retrospective cohort study using California Perinatal Care Collaborative (CPQCC) data from 2016 to 2023 across 138 hospitals. Infants with gestational ages between 22 weeks 0 days and 31 weeks 6 days were included. Exclusions were cord milking, death in the delivery room, or missing data. DCC exposure was defined as a delay in cord clamping of at least 30 seconds. Analyses used linear regression adjusting for gestational age (in days) as a second-order polynomial and intrauterine growth restriction (IUGR). Results: Of 38,713 eligible infants, 6,079 were excluded (cord milking, delivery room deaths, and missing DCC information), leaving 32,634 very preterm infants for the analysis. The mean weight for infants who received DCC was 1,338g (SD 404) compared to 1,290 g (SD 431) for those who did not. After adjusting for gestational age and IUGR, DCC was associated with 24g higher first-recorded weight (95% CI: 18-29). Conclusion: In very preterm infants, at least 30 seconds of DCC is associated with a modest increase (24g) in first-recorded weight. This finding reinforces evidence from small clinical trials showing increased blood volumes and weight gains attributed to deferred cord clamping.
Quinn et al. (Fri,) studied this question.