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Congenital esophageal stenosis is a rare and heterogenous malformation often associated with esophageal atresia (EA). Failure of conservative endoscopic treatment leads to surgery. Transthoracic approach is rarely advocated due to the peridiaphragmatic localization of the stricture. Robotic-assisted thoracoscopic surgery (RATS) may offer enhanced precision in confined spaces; its application in patients under 10 kg is still considered a challenge. We report the first description of RATS resection of cartilaginous congenital stenosis and esophagoesophagostomy in a 9.5 kg patient. A female patient with a history of EA type III was corrected via videothoracoscopy, two cardiac surgeries via sternotomy, and laparoscopic treatment of duodenal atresia. During weaning, she did not tolerate thickened food, and endoscopy revealed a patent anastomosis but a distal esophageal stricture. A course of pneumatic dilation was attempted. Persistent clinical and radiological findings indicated the need for surgery. At 15 months, the patient underwent three-trocar thoracoscopy with the da Vinci Xi system. Esophagoscopy helped the identification of the stricture. A longitudinal incision exposed a 2-cm segment of thickened esophageal wall requiring complete excision. A tension-free end-to-end anastomosis was performed using 4/0 PDS. Tracheobronchial remnants were confirmed at histopathologIcal finding. Esophageal contrastography demonstrated a good diameter anastomosis. One month after the operation, she was able to swallow solid food. Surgery for congenital stenosis is indicated when endoscopic management fails. RATS for esophageal diseases in patients under 10 kg is feasible, and peridiahragmatic esophagus particularly suits to this technique. Previous accesses to the thorax seems not to be a limitation.