IntroductionInfants with esophageal atresia and tracheoesophageal fistula (EA/TEF) are at increased risk for respiratory compromise and gastric perforation until fistula ligation. We sought to describe current practice regarding the timing of EA/TEF repair and hypothesized that age at repair is a predictor of adverse outcomes. MethodsThe Pediatric Health Information System (PHIS) database was used to identify patients with EA/TEF who underwent fistula ligation and esophago-esophagostomy at US children’s hospitals from July 2016-June 2021. Patients with a repair >10 days of age, a long-gap atresia, or H-type fistula were excluded. Comorbidities including prematurity and operative congenital heart disease were noted. Outcomes including anastomotic leak, gastric perforation, and post-operative respiratory failure were assessed for association with age and day of the week of operation. ResultsAmong 863 patients that were evaluated, the plurality of operations was on DOL 2 (36%) and 83% were on a weekday (random rate = 71%). Later operations had shorter LOS (p=0.04) and more recurrent nerve injuries (p=0.01). Weekend repairs were associated with equivalent outcomes. Gastric perforations occurred in 18 (2.0%) patients; 11 (61%) of these occurred after DOL 2. ConclusionsWe found no significant differences in outcomes other than more recurrent nerve injury and decreased LOS with EA/TEF repair at older ages. Although repair beyond DOL 2 was safe from a respiratory standpoint, most gastric perforations occurred after this point. In the absence of contraindications or significantly reduced weekend capabilities, we recommend repair of EA/TEF by DOL 2. Level of EvidenceIII