Whether the baby’s mental retardation can be cured: First, it depends on the degree of mental retardation. If it is a serious mental retardation, the chance of cure is generally small. Second, check the cause of mental retardation, some genetic metabolic diseases or chromosomal diseases can be improved through treatment, or close to normal children, but can not be completely cured, the main thing is to depend on the severity of the child’s condition. Third, it needs to depend on the different ages of the affected children. If the affected child is still seriously different from a normal child at the age of 6, it is generally more difficult to cure. Generally, 2-3 years old is an important period for language development. If intellectual problems are detected early, more mildly affected children can be cured through timely treatment. Fourth, if there are genetic metabolic diseases, such as phenylketonuria children, if through timely treatment, their intelligence level can be close to the level of normal children, this is not a cure, but their intellectual development level is also close to that of normal children. Fifthly, for chromosome 21 disorders, although the overall intelligence level is backward, some children can reach or even exceed the normal level in some aspects, such as in music, etc. They can approach, reach or even exceed the normal children.