Introduction: Ebstein's anomaly is a rare malformation that corresponds to less than 1% of all congenital heart anomalies. It consists in the caudal displacement of the tricuspid valve with retrograde flow to the right atrium due to valvular insufficiency and it is characterized by a variable spectrum of severity, being higher in the neonatal period. Objective: to report an Ebstein's anomaly case which early diagnosis avoided iatrogenic ducts. Case report: a newborn at term, appropriate weight for gestational age, female, was born of natural childbirth, with Apgar score 8/9 from pregnancy without complications. At birth, not in need of resuscitation in the delivery room, but presented heart murmur and fall of saturation, being supported and then forwarded to the NICU. Not present hemodynamic instability. The chest x-ray showed increased cardiac area with increased right atrium. The Transthoracic Echocardiogram showed mild right ventricular dilatation and important of the right atrium, tricuspid valve dysplasia with low implantation of posterior leaflet of tricuspid insufficiency presence important to Doppler, being diagnosed with Ebstein's anomaly. Evolved with progressive improvement of the frame and saturation above 95% on room air to pulse oximetry. Patient follows in outpatient follow-up in use of inotropic and diuretic, remaining asymptomatic. Conclusion: the recognition of the gravity of the picture is relevant to the proper management in order to prevent iatrogenic ducts, which can lead to complications or permanent sequelae.