Some babies often catch colds and flu, parents are very anxious, heard that playing “C ball” has a preventive effect, so they often buy it for their children to inject, but the effect is not ideal. Because “C ball” is made of mixed healthy human plasma as raw material, mainly containing immunoglobulin G. Although this substance is related to the body’s ability to fight infection to a certain extent, it is not effective in reducing the incidence of colds. This is because: 1, the real culprit of cold is virus rather than bacteria, and there are many types of cold viruses, which often change; 2, the level of immunoglobulin G in the blood of healthy children and most infirm children is normal and not low; 3, the effective antibodies contained in “C ball” are limited and generally do not contain specific antibodies. Therefore, the “panacea” to prevent pediatric colds is: adhere to breastfeeding, adhere to the “three baths” exercise from childhood (i.e. sun bath, water bath, air bath), according to the procedure of vaccination, the correct implementation of life care, and never put your hope on The “C ball” on.