1. Colostrum: Human colostrum contains a large number of antibodies, especially secretory IgA (SigA). As mentioned before, secretory IgA (SigA) can enhance the ability of respiratory mucosa to resist the invasion of pathogenic microorganisms, and therefore has the effect of preventing respiratory tract infections. Some data show that the milk secreted by dairy cows in the first 5 days postpartum is rich in SIgA. Therefore, in order to improve the disease resistance of children with recurrent respiratory tract infections, you can take human or animal colostrum 3 days after delivery, 10 ml each time, 1-2 times a day, for 1 week; you can also take colostrum Milk preparations. 2. Foods that strengthen the spleen, replenish qi and strengthen the surface: if taken regularly, it can enhance the physical fitness of children and reduce the number of respiratory infections. These foods mainly include: vegetables including rape, leeks, coriander and onions; roots and beans such as carrots, white radish, yams, pumpkins and soybeans; fruits including dates, pears and bananas; dried fruits such as peanuts and walnuts , sesame, sunflower seeds; in addition, there are seaweed and mushrooms. 3. Medicinal diet: It has the effects of enhancing resistance, fitness and disease prevention. Children can take it for a long time if conditions permit. Lily and peanut porridge: 20 grams of dried lily, add water to swell; 30 grams of peanuts, add water and skin and cook, then add 60-80 grams of glutinous rice, add water to cook the porridge, finally add a little sugar and take it. Tremella soup: 10 grams of Tremella and 6 grams of Shiitake mushrooms. First, boil the Shiitake mushrooms in soup and filter the residue, then add the Tremella fuciformis into the soup, cook it over a slow fire until it becomes soup-like, and then consume it. You can add a little rock sugar and drink it in one day. Can be taken continuously. Polygonatum and jujube soup: 6 grams of Polygonatum and 20 grams of red dates. Add water to boil a bowl of soup and take the soup and dates together. Can be taken continuously. Qi-boosting double mushroom noodles: Take 10 grams of astragalus and decoct 50 ml of soup, then take 25 grams each of fresh mushrooms and water-frozen mushrooms, add appropriate amount of oil, stir-fry, then add astragalus soup and cook. Cook an appropriate amount of noodles, take them out and put them in the astragalus and double mushroom soup. Add seasonings until cooked. Regular consumption as a staple food can increase resistance. Lung-warming chicken soup paste: 250 grams of hen meat, 300 grams of pork leg, 10 grams of cinnamon, 20 grams of Codonopsis pilosula (wrapped in gauze), add 3000 ml of water and cook until the meat is tender. After removing the meat and medicine, about 2000 ml of soup remains. , and then cut the chicken and pork into shreds. Take 100 grams of oatmeal, put it into a pot and boil it, then slowly add 200 grams of flour to make a uniform paste, and finally add an appropriate amount of salt and MSG. When eating, take an appropriate amount and add minced chicken, pork and a small amount of sesame oil. It is best to eat it in winter. Regular consumption has a good effect in preventing respiratory tract infections.