Malnutrition is due to insufficient food intake, or because the food can not be fully absorbed and used, so that the normal metabolism can not be maintained, resulting in the body consumes its own tissue, there is no weight gain or loss, growth and development stagnation, fat gradually decreased, muscle atrophy. The weight of malnourished children is more than 15% lower than the average weight of normal children of the same age and sex. There are many causes of malnutrition. The common ones are improper feeding, such as insufficient breast milk and not increasing milk substitutes, artificial feeding with more milk and water, less frequent feeding throughout the day, so that the infant is in a state of hunger; long-term feeding of infants with milk cake, rice soup, lack of protein and fat; failure to add supplementary food in time or sudden weaning, improper handling of dietary transition; poor dietary habits or partial eating, so that infants and young children’s appetite is reduced, affecting the normal amount of food, and gradually lose weight. Infants and toddlers gradually lose weight. Diseases are also an important cause, mostly chronic gastrointestinal diseases, such as chronic diarrhea, other diseases, such as recurrent respiratory infections, measles, prolonged hepatitis, tuberculosis, chronic otitis media, etc. These diseases make it easy to vomit or consume more after eating and can lead to malnutrition in infants and children. Malnourished children are susceptible to other diseases because of their poor resistance to disease. The sick children are combined with multivitamin deficiency, anemia, etc. Malnutrition is not corrected, will seriously affect the growth and development of infants and young children. Malnutrition adjustment methods are: 1, mental conditioning: children suffering from malnutrition often appear mental anxiety, impatience, nervousness. Parents should cooperate in a timely manner to do a good job of patient guidance, so that the child is in a happy mood, which helps the intestinal peristalsis, thus enhancing digestion and absorption function. 2, life conditioning: infants should add complementary foods on time, to master the principle of first thin and then dry, first vegetarian and then meat, first less and then more. Promote breastfeeding. Correct the bad eating habits such as snacking, diet partiality, uneven hunger and satiety. Regularly measure the height and weight of the child. Make sure the room is well-lit, with fresh air, soft clothes and warmth to prevent colds and other illnesses.