Assessed for eligibility: 2099 mother–newborn dyads
Excluded: 89 dyads in total • Unknown maternal GBS culture result • Extreme prematurity (<28 weeks) • Multiple pregnancy • Abnormal prenatal or postnatal genetic test results • Neonatal anatomical abnormalities potentially causing respiratory disorders Counts by individual criteria unavailable	Included: 2010 mother–newborn dyads   Analytic cohorts shown below