If children's immunity is relatively low, they will get sick repeatedly. Parents can adjust from the following aspects: 1, and give their children plenty of milk. Because milk is rich in high-quality protein, and it can supplement calcium. If the child's protein supplement is enough, the natural immunity will be significantly improved and the illness will be much less. 2. Do more exercise. Because exercise can promote children's blood circulation, which is conducive to the improvement of immunity. The principle of exercise is mainly based on chronic aerobic exercise. Don't do strenuous activities, otherwise it will cause children to catch cold and catch a cold. Common chronic aerobic exercise mainly includes swimming, jogging, walking, etc. These exercises are relatively safe and easy for children to accept, which is also conducive to the improvement of immunity.