The immune system of children needs a process to develop, and it tends to mature after about 7 or 8 years of age. Generally speaking, before the age of half a year, children are less susceptible to infectious diseases because they have inherited some immune substances from their mothers, but after 6 months, their immunity decreases due to the depletion of immune substances in their bodies and the lack of their own ability to synthesize immune substances, and then the course of recurrent respiratory infections in children begins. Therefore, low immunity in children before the age of 8 is a physiological condition, not a pathological one (and of course, there is no need to intervene with drugs in advance.) After the age of 8, with the maturation of their own immune system, recurrent colds will automatically get better. In other words, colds and coughs are normal and are a necessary part of a child’s growth, so there is no need to be overly anxious (mainly for parents). Repeated respiratory infections in turn can stimulate the rapid development of the body’s immune system, which is generally a good aspect that parents are not aware of. So what do you do when you have a cold? Just treat it with a normal heart. The usual attention: strengthen exercise, especially cold exercise. As the ancients say, if you want your child to be safe, you should always suffer from hunger and cold. Children’s bodies are pure Yang body, love to run, activity, heat production, so often a sweat, if dressed too warm is not easy to dissipate heat, in case of sudden climate change by cold is easy to catch a cold. Appropriate clothing and cold exercise will help children adapt to the external climate. Strengthen nutrition to meet the needs of growth and development. The formula for calculating the weight of children before the age of 12 is: weight = age * 2 + 10. Generally speaking, children who have reached the standard weight are strong and are less likely to suffer from infectious diseases. Therefore, it is important to strengthen scientific feeding to meet the needs of the growth and development of children. The last point (in fact, the least important point) is the medication regulation. Still the above two aspects, one is to regulate the yin and yang, in line with the child less Yang physique nourishment; the second is to regulate the child’s spleen and stomach, improve the appetite of children, enhance the positive energy and resistance to disease.