There are many reasons why infants often sneeze, commonly caused by environmental stimuli, respiratory tract infections, allergic rhinitis and other factors. 1. Environmental stimulation: The respiratory tract of infants and young children is not yet fully developed, so they are easily affected by the external environment. If the dust, smoke or cold air in the environment stimulates the respiratory tract of infants, it can cause infants to sneeze. The living environment should be improved in time. 2. Respiratory tract infection: If sneezing occurs after getting cold, there may be a respiratory tract infection, which can be combined with runny nose, nasal congestion, cough and other manifestations. 3. Allergic rhinitis: mostly related to genetic factors, often occurring after contact with allergens, due to nasal secretions that stimulate the mucous membrane of the nasal cavity, which can lead to reflex sneezing. This condition usually requires treatment of the primary disease to improve the sneezing symptoms. In conclusion, infants who experience frequent sneezing should go to the hospital in time and be treated under the guidance of the doctor.