Two main forms of hamartomas are found in the lung, chondromas and hemangiomas. Hemangiomas occur either as single lesions or as diffuse pulmonary hemangiomatosis, which is a very rare but fatal disorder. The disease frequently manifests asymptomatically, and mainly in adults. Patients most often do not experience any symptoms and the disease manifests as late as in the adult age with cough, hemoptysis, chest pain and fever associated with pneumonitis. Usually, the disease progresses rapidly, and causes secondary veno-occlusive disease leading to pulmonary hypertension or bleeding. Diagnosis is difficult, and radiography often gives no evidence. There is need for an aggressive approach which in most cases is followed only after the onset of severe complications. In newborns these lesions are chiefly detected incidentally at autopsy; visceral hemangiomas do not regress spontaneously. Since an accurate diagnosis depends on open biopsy, conjoint resection can be easily performed in most instances, this may even become a necessity when complications occur. We report about 3 cases of pulmonary hemangiomas in newborn babies who were diagnosed shortly after birth and treated surgically during the first months of life. In 2 cases, surgical treatment cured the patients, 1 case took a fatal caurse. Early diagnosis may allow to restrict the surgical procedure and may in some cases even cure the patient, anyhow it prevents complications.