Newborns sneeze all the time, which can be caused by environmental factors, may also be suffering from upper respiratory tract infection. 1. Environmental factors: when a newborn is just born, due to the large difference between the environment temperature and the mother’s temperature, it will make the respiratory tract suffer from irritation and sneezing symptoms, which is a physiological reflex. In addition, if there is an irritating smell in the environment, the baby will also have reflexive sneezing and coughing. 2. Pathologic causes: If a newborn baby has frequent sneezing that cannot be relieved, an upper respiratory tract infection may be present. In addition to sneezing, there may be watery nasal discharge, low-grade fever and gastrointestinal reaction in severe cases. If your newborn sneezes constantly, you need to go to the hospital in time to clarify the cause of the disease and then have the corresponding treatment.