Cohort Description 18 Delivered vaginally Delivered by c-section Gender 37Wk+ 37Wk+ 35wk Gestation(wk) Antibiotic 0 treatment travenous antibiotics 1510 0 0 Delivered by c-section 0 15 Cohort Description Gender 16 21 19 Delivered vaginally Gestation (wk) 1 37wk+ 35wk 1 37wk+ 35wk Antibiotic treatment intravenous antibiotics 18