Sneezing arises from the nasal mucosa being congested and stimulated by an itchy sensation; just like the cough reflex, it is a protective reflex that clears out harmful substances from the body through a strong airflow. Any change in temperature and humidity in nature can stimulate the rich olfactory nerve fiber endings in the nasal mucosa and induce him to sneeze continuously. There are three possible causes of sneezing in infants: 1. Babies are small and their nasal mucosa is sensitive. They sneeze when they have boogers in their nasal cavity, or when they are exposed to cold air, flying insects in the air, hairy hair, very small odors and other external stimuli, and this situation usually gets better soon. 2.If you sneeze a lot and sneeze whenever you encounter hot and cold air, and your nose itches and rubs, pay attention to allergic rhinitis; there are more reasons that lead to allergic rhinitis in babies, one is that there are genetic factors, and the other is environmental pollution, such as inhaling air containing pollen, dust mites, fungi, pet dander, feathers, etc. 3, if the baby not only sneezes, but also has a runny nose, cough and other symptoms, then we should consider whether it is a cold, the situation is not serious, you can observe at home, the symptoms do not ease, should promptly go to the hospital to avoid delaying the condition. To analyze the possible causes of the baby sneezing, do not think that once the baby sneezes, it is a cold, and blindly eat some drugs.