A child who does not grow meat and is particularly thin may be related to genetic factors, malnutrition, gastrointestinal diseases and other reasons. 1. Genetic factors: If one or both parents are thin, the child may also be thin. 2. Malnutrition: partiality, picky eating, eating a small amount of food and other reasons may cause the body nutrition is not balanced or lack of nutrients, will lead to the child does not grow meat, the body especially thin. 3. Gastrointestinal diseases: If the child’s gastrointestinal dysfunction, it will affect the absorption of nutrients, resulting in the child does not grow meat. There are other reasons why children do not grow meat, such as endocrine system diseases, etc. Parents are advised to take their children to the hospital in time to clarify the causes, and if treatment is needed, it should be standardized under the guidance of the doctor to avoid delaying the condition.