Many parents face a problem when their children start kindergarten. The child has a cold, cough or even a fever for three days, goes to the hospital or a nearby clinic, and is fine. But in a few days, the same symptoms come back again. It’s a painful experience. ? For this case, do I need to take some medicine to adjust my immunity? If so, what medications can I choose? The immune status of pediatric patients is significantly different from that of adults, leading to the specificity of childhood diseases. At birth, immune organs and immune cells are quite mature, and low immune kinetic energy may be the result of not being exposed to antigens and not having established immune memory yet. In other words, children who never get sick at home always get sick in kindergarten because they have been exposed to viruses or bacteria that they were not exposed to because of the change in their environment. For most children, after the first six months or a year of kindergarten, recurrent respiratory infections will improve significantly, so there is no need to take oral immunity-adjusting drugs. If a child between the ages of 2 and 5 has more than 6 upper respiratory infections and more than 2 lower respiratory infections in a year (if the number of upper respiratory infections is not enough, the number of lower respiratory infections can be added, but not vice versa), he or she can be diagnosed with recurrent respiratory infections. There are two things to consider for children with recurrent respiratory infections. First, consider getting some flu or pneumonia vaccinations. Second, consider an oral immune booster. Immune boosters are primarily used to fight infections. Common immune-boosting agents include microbial agents (bacterial agents such as Panfosol, Bestyn, Lantus, and mycobacterial agents such as BCG and its extracts), chemical agents (pidomod, levamisole, imiquimod, etc.), biological agents (immunoglobulins, thymidine, interferon, transfer factors), and herbal agents (Astragalus, etc.). These drugs are different depending on their composition and mechanism of action and are considered differently when choosing them. If the child is considered to have recurrent respiratory infections, a hospital visit is needed to check the humoral and cellular immunity to understand the child? In short, it is a normal process for children who are new to kindergarten to get sick, and parents should understand this issue correctly, as it is a lesson that is indispensable for the growth and development of the child. However, if frequent respiratory infections have affected the child’s normal life and reached the standard of recurrent respiratory infections, I am afraid that we must go to the hospital to find out the cause of the disease and treat the symptoms.