Objective:The objective of the study was to present a rare clinical case in neonatology, and emphasize the importance of teamwork that involves its clinical care. Effective communication and timely intervention increase patient success and survival rates. Case: Male patient at 37.4 weeks of gestation with a medical record of a mother with a positive rapid HIV test that during her follow-up appointment presented a persistent fetal heart rate above 220 beats/min, with a report of probable atrial fibrillation and restrictive ductus arteriosus. Programming an emergency cesarean section, a newborn was obtained who received electrical cardioversion, presenting a remission of symptoms. Discussion: A timely detection of prenatal atrial fibrillation was made thanks to the perinatologist, and following the recommendations of the literature, electrical cardioversion was performed. If it had not been detected in a timely manner, the patient could have died. Conclusions: It is significant to highlight that the detection of pathologies prenatally is becoming increasingly more important, since many of them require early and multidisciplinary management. It is fundamental, both for its diagnosis and for the success of the treatment, that the entire medical team is aware of the suspected diagnosis, as well as the immediate post-natal confirmation.