Children who are thin and do not grow meat may be caused by a variety of reasons such as genetic factors, malnutrition, disease factors and so on. 1. Genetic factors: Due to the influence of genetic factors, if the parents’ body type is thin, the children may be thin and do not grow meat. It can be improved by strengthening feeding and physical exercise later in life, eating more protein-rich food and exercising more. 2. Malnutrition: For example, when iron, zinc and other trace elements are deficient, the child’s appetite is lost, leading to loss of appetite, anorexia, and the occurrence of diarrhea. According to the lack of different elements, follow the doctor’s instructions to use zinc gluconate oral solution and ferrous sulfate oral solution to supplement zinc and iron and other elements, or oral lysine Vitamin B12 granules to enhance the child’s appetite, to promote the child’s growth and development. 3. Disease factors: such as hypothyroidism, can use levothyroxine sodium tablets for replacement therapy. It is recommended that the child should develop a good daily routine, ensure balanced nutrition, correct the bad habits of picky eating, partiality, and appropriate supplementation of micronutrients. If you suspect that the disease is a factor to consult a doctor in time, under the guidance of the doctor to use medication.