Newborn viral infection fever is relatively common, the main causes of low immunity, gastrointestinal infections, respiratory infections and so on. 1. Low immunity: the immune system of newborns is imperfect, susceptible to external viral attack and stimulation, contact with people, objects or the environment carries a viral source, newborns will also be infected by viruses leading to fever. 2. Digestive tract infections: the digestive system of newborns is very weak, such as rotavirus or norovirus, if the virus carriers have contacted the items that the child needs to come into contact with, through the fecal-oral transmission, the child will also be infected with the corresponding virus leading to fever. 3. Respiratory tract infections: Respiratory tract infections are viruses that enter the mucosal tissues of the respiratory tract through the respiratory tract, and the infected child will have symptoms such as coughing, fever and sneezing. Newborn viral infection fever may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.