Clinical Research Directory

Inclusion Criteria: 1. All newborns ≤ 28 days corrected age or ≤ 44 amenorrhea weeks corrected age hospitalized in neonatal medicine with isolated rectorrhagia; 2. Affiliated to social security ; 3. Presenting isolated rectorrhagia defined as rectorrhagia without hematemesis/ repeated vomiting/ tense or distended abdomen/ apathy/ apnea/ bradycardia or signs of severity (tachycardia, desaturation, poor coloration); 4. After obtaining the biological mother's non-objection; Exclusion Criteria: 1. All newborns with ulcerative enterocolitis, congenital digestive malformations or rectorrhagia following digestive surgery; 2. Opposition to participation in research involving the human person.