Mental Retardation - Symptoms
The symptoms of mental retardation usually appear early in life. Children with the disorder tend to develop more slowly than normal. They may learn to sit up, to walk, to talk, and to perform other simple tasks later than average. Mental retardation is often accompanied by other symptoms as well. These symptoms include aggression, a tendency toward self-injury, and personality changes. As a child grows older, the best indication of mental retardation is the standard intelligence tests.