Nucleic acid testing is usually not routinely required for newborns at two to three months of age, but should be done as soon as possible if there are manifestations of novel coronaviruses, or if there is a history of exposure. 1. Manifestations of novel coronavirus: If the newborn presents with cough, fever, malaise, absence of sputum, sore throat, dysphagia, and impaired multifunctionality, nucleic acid testing is usually ordered, as these reactions may be symptoms of novel coronavirus. 2. History of exposure: If the newborn lives in a high-risk area, or if the newborn has a history of relevant exposure to people in the surrounding population with confirmed or asymptomatic infections, then the newborn will be asked to do nucleic acid testing. This is because newborns can be infected with novel coronaviruses, which can be detected in a timely manner. The nucleic acid test for newborns at 2-3 months will not affect the body in any way and will not leave any after-effects, so parents do not need to be overly nervous and can cooperate with the doctor for the nucleic acid test if necessary to avoid the development of the disease.