What is a normal IQ for a 9-year-old child?

To really test IQ, you have to go to the psychology department of the hospital. It's mildly mentally retarded. IQ is 55-69. With correct education and training, such children can become close to normal. Moderately mentally retarded. IQ is 40-54. After special training, they can develop certain living abilities. Severely mentally retarded. IQ is 25-39. With specialized training, only a certain degree of improvement can be achieved. Extremely mentally retarded. IQ is below 25. Such children require lifelong supervision.

What are the causes of mental retardation?

1. Mechanical damage to the brain and hypoxia: accounting for 19.6. Brain damage can be caused by physical or mechanical factors before, after, and during delivery, such as birth trauma and craniocerebral trauma. Severe perinatal blood loss, anemia, heart failure, lung disease, neonatal asphyxia, intracranial hemorrhage, etc., as well as cerebral hypoxia after drowning, anesthesia accident, and sustained epilepsy.

2. Social psychological factors: accounting for 8.2. Such children do not have organic brain lesions and are mainly caused by adverse environmental factors such as neuropsychological damage and sensory deprivation, such as a severe lack of early appropriate stimulation and education.

3. Infection and poisoning: accounting for 12.3%. Infection refers to brain infections before and after birth, such as rubella, cytomegalovirus, toxoplasma, herpes simplex virus and other viral infections.

For baby intelligence testing, it is recommended to go to a regular hospital for testing. If the baby is found to be mentally retarded, treatment must be provided in time to avoid lifelong effects on the child.