2 months old baby sneeze for the following reasons: 1, the nasal mucosa is more tender, easy to be stimulated by the outside world, when the outside harmful air or smoke stimulate the baby’s nasal mucosa, it will cause sneezing, usually to the fresh air environment will disappear; 2, upper respiratory tract infection. The virus then enters from the nasal cavity, easily causing local infection, inflammation oozing out to form nasal snot, sneezing can discharge the snot; 3, there is another is 2 months old baby is milk or breastfeeding, sometimes when feeding milk accidentally choke to the trachea, baby’s nasal cavity is short, choke to the mouth part of the milk will flow to the nasal cavity, baby through cough and sneeze to discharge milk; 4, baby if a long time of clear nose, Sneezing, more than 1 week is not good, but also consider allergic rhinitis.