For children under 6 years old, it is very normal to have an average of 6 to 8 colds per year. It is also normal for children who have just started kindergarten or elementary school to get sick 1 to 2 times per month, so there is no need to worry. The following conditions indicate low immunity: (1) always sick with growth retardation; (2) each illness does not improve on its own and requires intravenous fluids or hospitalization; (3) each bacterial infection requires more than two months of antibiotics and is still not effective; (4) each illness is a serious infection, such as meningitis or sepsis; (5) blood tests show that the immunity of the child is low. Immunity is low; as the above criteria to consider the baby’s immunity is relatively low, usually in the diet more food containing vitamin C, such as potatoes, oranges, kiwis, tomatoes and so on, and mushroom food, such as enoki mushrooms, apricot mushrooms is conducive to enhancing the child’s resistance, in terms of exercise must be more exercise, more sunshine, in terms of drugs can be used in the Chinese medicine Yu Ping Feng particles or western medicine This is a good idea, as well as the health products, such as lactoferrin and protein powder, are able to enhance the child’s resistance. If the effect is really bad, you can go to the hospital for intravenous immunoglobulin injection.