Some Causes of Mental Retardation
1. Following infection & intoxication [e.g. rubella]
2. Following trauma or physical agent [e.g. birth injury]
3. Disorders of metabolism or nutrition [e.g. PKU]
5. Diseases & conditions with unknown prenatal influences [e.g. NTDs]
6. Chromosomal abnormalities [e.g. Down syndrome]
7. Gestational disorders [e.g. prematurity]
8. Psychiatric & developmental disorders [e.g. autism]
9. Environmental influence [e.g. poor nutrition, health care, stimulation]
10. Other conditions with unknown cause