Maternal Supine Sleep in Late Pregnancy: No Impact on Fetal Growth in Prospective Cohort Study

Highlight

• Objectively measured supine sleep duration in late pregnancy shows no association with customised birthweight centile.
• Different supine definitions and risk indices measuring degrees of maternal position did not impact fetal growth outcomes.
• Supine sleep position remains implicated in stillbirth risk through mechanisms likely unrelated to fetal growth.
• Large prospective studies to explore causality are limited by the low incidence of stillbirth.

Study Background