Causes of brain retardation

The causes of brain retardation are complex and involve a wide range of: first, genetic factors. Chromosome abnormalities, chromosome number abnormalities and structural abnormalities, can cause mental retardation, congenital metabolic defects. Second, pregnancy, birth abnormal factors. The first 3 months of pregnancy is the initial formation of fetal nervous system structure, vulnerable to pathogenic factors damage and cause obvious abnormalities. Third, factors at birth. Due to abnormal fetal position, long labor, umbilical cord around the neck and other reasons, can cause newborns to show asphyxia, hypoxia, ischemic encephalopathy or intracranial hemorrhage, so that the central nervous system damage. Four, postnatal factors. After birth 2 years brain development is the fastest, pathogenic factors in this period caused by brain damage is also more serious. Five, social psychological factors. Such as culturally backward areas, low educational level of parents, resulting in children can not receive cultural education, but also one of the reasons for mental retardation.