If children often recurring respiratory tract infections or recurring gastrointestinal tract infections, it is mainly due to weak resistance. You can use the following drugs or food to improve: first of all, you can eat yam porridge, because yam has a good spleen, can effectively enhance the children’s spleen and stomach function, the children’s spleen and stomach function after the improvement of digestion, absorption capacity will be strengthened, so that the qi and blood will be very sufficient, so that the immune system will be effectively strengthened. Secondly, you can give children more food of fungus, because fungus food can effectively regulate immunity, so as to enhance the resistance of children. Then you can give children medicines, if you take traditional Chinese medicine, you can apply Yubingfeng Granules, which has the function of tonifying qi, strengthening the spleen and consolidating the surface, if you take western medicine, you can apply Splenic Amino Peptide Oral Liquid or Transfer Factor Oral Liquid to children.