Sneezing in one-year-old babies may be a normal physiological phenomenon, or it may be caused by colds, allergic rhinitis and other factors. 1. Normal physiological phenomenon: a sudden change in temperature or the baby inhaled some irritating gases, such as dust, dust, etc., the phenomenon of sneezing will occur, belonging to a self-protection way, can prevent diseases. 2. Colds: one-year-old baby body immunity is low, improper parental care, may suffer from viruses caused by colds, which can lead to increased reactivity of the nasal mucosa, it will sneeze frequently, accompanied by runny nose, fever, cough and other symptoms. 3. Allergic rhinitis: one year old babies exposed to some easily allergic substances, such as animal hair, dust, easy to cause allergic rhinitis, will frequently sneeze, may also be accompanied by runny nose, nasal congestion and other symptoms. One year old babies sneezing frequently, and accompanied by other abnormal manifestations, may be the existence of disease factors, it is recommended to seek medical treatment.