What are the factors that lead to the emergence of pediatric mental retardation? The pathogenic factors of the mother’s gestation period: the early 8-12 weeks of gestation is a critical period for the development of the fetal brain in the mother’s body, various physical and chemical toxins, public hazards, radiation, tobacco, alcohol, viral infections, are pathogenic factors that cause fetal brain dysplasia, followed by abdominal trauma to the pregnant woman, drug abuse, mental and psychological stimulation, fetal and maternal blood type incomplete, can cause fetal development to be impaired, so that The child will be mentally retarded. Various factors in the perinatal period: difficult delivery, prolonged labor, brain damage due to various reasons, ischemic-hypoxic encephalopathy, all of which can impair brain development and cause mental retardation in children. Genetic factors: is a common cause of pediatric mental retardation, such as parental mental retardation, parents have inbred marriage or parents dyed with body abnormalities, parents suffer from certain metabolic diseases, such as phenylketonuria, the father can pass on congenital mental defects to the offspring, resulting in pediatric mental retardation, if one of the parents is mentally retarded or both parties are mentally retarded, the incidence of mental retardation in their children is as high as 77- The incidence of mental retardation in their children is as high as 77-96%.