Childhood malnutrition is generally judged according to the World Health Organization’s growth and development curves. Children younger than five years old are judged directly by weight-for-age growth and development curves, and children older than five years old are judged by body mass index (kilogram weight divided by height squared, with height in meters). Less than two standard deviations from the average for the same age and gender is called moderate malnutrition, and less than three standard deviations from the average for the same age and gender is called severe malnutrition. The dangers of malnutrition in children include. First, malnutrition affects the growth and development of children, not only low weight, but also low height and low intelligence; second, malnutrition in children can seriously affect the physical health of children, because the immune function of malnourished children is low, children will have repeated respiratory infections, diarrhea, in addition, malnourished children are prone to deterioration in case of illness, and the death rate is significantly increased. In addition, malnourished children are prone to deteriorate in case of illness and have a significantly higher death rate.