Provided is a method for preventing the onset of an allergic disease in the infant stage and thereafter. A medicine containing an anti-IgE antibody for suppressing the production of an allergen-specific IgE antibody in the infant stage, which is characterized by being to be administered to a pregnant woman and/or a baby at any point from the newborn stage to the infant stage. A medicine containing an anti-IgE antibody for suppressing IgE class-specific immunoreaction from the fetal stage to the infant stage, which is characterized by being to be administered to a pregnant woman and/or a baby at any point from the newborn stage to the infant stage.
