Pulmonary cystadenoma, also known as congenital lung airway malformation, occurs in the fetal period, and in the vast majority of fetuses the size of the lesion does not change significantly, and in the postnatal period most of them do not continue to grow significantly. Symptoms in babies born with cystadenoma of the lungs are mainly related to the size of the cyst and the compression of the surrounding organs, and may be manifested by recurrent lung infections, shortness of breath, dyspnea, respiratory distress, and cyanosis, etc. The younger the age, the higher the chance of developing compression symptoms. In the presence of secondary hemorrhage or infection, the cyst may suddenly increase in size, with acute symptoms of compression or infection. If the cyst is small and not growing significantly, elective surgery can be considered, which is performed around 6 months after birth. Depending on the size of the lesion, segmental resection or lobectomy can be used, and the postoperative recovery can be smooth without affecting future growth and development. If the lesion is large, it needs to be removed as soon as possible. Patients should undergo regular checkups to observe the changes in their condition in time to avoid any adverse consequences.