Planned Birth Before 39 Weeks and Child Development: A Population-Based Study published in Pediatrics

Published in the November 2016 Issue of Pediatrics, along with a companion article, “The Timing of Planned Delivery: Strengthening the Case for 39 Weeks.”

Authors: Jason P. Bentley, Christine L. Roberts, Jenny R. Bowen, Andrew J. Martin, Jonathan M. Morris, Natasha Nassar

DOI: 10.1542/peds.2016-2002


OBJECTIVE: To investigate the association of gestational age and mode of birth with early child development.

METHODS: Population-based record linkage cohort study was conducted among 153 730 live-born infants of ≥32 weeks’ gestation with developmental assessments at school age, in New South Wales, Australia, 2002 to 2007. Children were assessed in 5 domains: physical health and well-being, language and cognition, social competence, emotional maturity, and general knowledge and communication. Children scoring in the bottom 10% of national domains were considered developmentally vulnerable, and children developmentally vulnerable for ≥2 domains were classified as developmentally high risk (DHR), the primary outcome. Robust multivariable Poisson models were used to obtain individual and combined adjusted relative risks (aRRs) of gestational age and mode of birth for DHR children.

RESULTS: Overall, 9.6% of children were DHR. The aRR (95% confidence interval) of being DHR increased with decreasing gestational age (referent: 40 weeks); 32 to 33 weeks 1.25 (1.08–1.44), 34 to 36 weeks 1.26 (1.18–1.34), 37 weeks 1.17 (1.10–1.25), 38 weeks 1.06 (1.01–1.10), 39 weeks 0.98 (0.94–1.02), ≥41 weeks 0.99 (0.94–1.03), and for labor induction or prelabor cesarean delivery (planned birth; referent: vaginal birth after spontaneous labor), 1.07 (1.04–1.11). The combined aRR for planned birth was 1.26 (1.18–1.34) at 37 weeks and 1.13 (1.08–1.19) at 38 weeks.

CONCLUSIONS: Early (at <39 weeks) planned birth is associated with an elevated risk of poor child development at school age. The timing of planned birth is modifiable, and strategies to inform more judicious decision-making are needed to ensure optimal child health and development.