Lack of weight gain or even weight loss is the first symptom of wasting malnutrition. Height may also be lower than normal if the disease is of long duration. The subcutaneous fat layer is not plentiful or completely lacking. The order of the subcutaneous fat layer is first in the abdomen, followed by the chest and back, then the upper and lower limbs and buttocks, and finally the forehead, neck and cheeks. When the fat layer of the facial skin disappears day by day, wrinkles form on the forehead, the cheekbones protrude, and the chin lengthens, forming the appearance of the elderly. What should be done in the prevention of obvious sunken cheeks caused by wasting? In the early stages of malnutrition, wasting is not easily detected if only the face is looked at without a general examination. When a large amount of subcutaneous fat disappears, the skin is dry, loose and loses its elasticity. Initially, it is often weepy and irritable, and then becomes sluggish. Appetite is good at the beginning, then low to disappeared, often with symptoms of acute digestive disorders such as vomiting and diarrhea. To prevent wasting malnutrition, breastfeeding should be promoted and supplemental foods should be given reasonably. If breastmilk is insufficient, it should be supplemented with milk replacer food. In addition, it should be inoculated on time to prevent the occurrence of infectious diseases, and doctors should be asked to diagnose and treat diseases or congenital malformations in time to reduce the consumption of nutrients. When suffering from diseases other than digestive system, the same attention should be paid to supplemental nutrition, improve the intestinal function, so that the resistance increases, the disease can be cured early, and do not lose weight due to prolonged illness. Timely supplementation of high-quality protein and adequate caloric energy is the main means of treatment of this disease, but due to the long-term undernutrition of the child, the digestive organs of the severe atrophy, digestive tract movement and digestive fluid secretion is reduced, so the treatment of malnutrition, should adopt the “cycle of gradual and gradual enrichment of the” principle. The supply of nutrients should be from small to large, from simple to complex, and should not be greedy for more and faster.