The causes of cyanosis in newborns include the following two conditions. First, it is caused by respiratory distress syndrome, if the child belongs to prematurity or lung dysplasia and lung surface active substance deficiency, which causes respiratory distress in newborns. After the child has respiratory distress, there is a lack of oxygen in the body, resulting in cyanosis, which can be treated with the application of lung surface active substance and ventilator support. Secondly, if the child has congenital heart disease, he or she will also have cyanosis and dryness of the limbs and lips.