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[Correspondence] INTERGROWTH-21st very preterm size at birth reference charts

In 2014, the INTERGROWTH-21st Consortium published international standards for newborn baby size, based on neonates with no major complications or ultrasound evidence of fetal growth restriction (FGR), who were born to healthy mothers without FGR risk factors.1 Despite our large sample size, very few neonates born at 33 weeks’ gestation or earlier met these prescriptive inclusion criteria. While implementing these standards, we have received many requests for very preterm, size at birth charts for clinical practice and research.