Infant sneezing may be related to upper respiratory tract infection, abnormal irritation, allergic rhinitis and so on. 1. Upper respiratory tract infection: when infants are infected by bacteria and viruses, symptoms such as nasal congestion, runny nose, sneezing, coughing and fever may occur. 2. Abnormal stimulation: Because the baby’s nasal cavity is short and small, and the nasal mucosa is sensitive, when exposed to cold air, dust and other stimuli, or when there is more nasal secretion, it can stimulate the baby to sneeze. 3. Allergic rhinitis: when the baby’s runny nose, sneezing lasts for more than 2 weeks or recurrent episodes, and the systemic symptoms are mild, allergic rhinitis should be considered as a possible cause, and eosinophilia in nasal swab smear can help to diagnose. Infant sneezing may have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.