• Continued infantile behavior
• Decreased learning ability
• Failure to meet intellectual developmental markers
• Inability to meet educational demands at school
• Lack of curiosity

Note: Changes to normal behaviors depend on the severity of the condition. Mild retardation may be associated with a lack of curiosity and quiet behavior. Severe mental retardation is associated with infantile behavior throughout life.

• Abnormal Denver developmental screening test
• Adaptive behavior score below average
• Development way below that of peers
• Intelligence quotient (IQ) score below 70 on a standardized IQ test

The primary goal of treatment is to develop the person's potential to the fullest. Special education and training may begin as early as infancy. This includes social skills to help the person function as normally as possible.

It is important for a specialist to evaluate the person for other affective disorders and treat those disorders. Behavioral approaches are important for people with mental retardation.

The outcome depends on:

• Opportunities
• Other conditions
• Personal motivation
• Treatment

Many people lead productive lives and function on their own; others need a structured environment to be most successful.

Complications vary. They may include:

• Inability to care for self
• Inability to interact with others appropriately
• Social isolation

Call your health care provider if:

• You have any concerns about your child's development
• You notice that your child's motor or language skills are not developing normally
• Your child has other disorders that need treatment

Genetic: Prenatal screening for genetic defects and genetic counseling for families at risk for known heritable disorders can decrease the incidence of genetically caused mental retardation.

Social: Government programs to ensure adequate nutrition are available to the underprivileged in the first and most critical years of life. These programs can reduce retardation associated with malnutrition. Early intervention in situations involving abuse and deprivation will also help.

Toxic: Environmental programs to reduce exposure to lead, mercury, and other toxins will reduce toxin-associated retardation. However, the benefits may take years to become apparent. Increased public awareness of the risks of alcohol and drugs during pregnancy can help reduce the incidence of retardation.

Infectious: The prevention of congenital rubella syndrome is probably one of the best examples of a successful program to prevent one form of mental retardation. Constant vigilance, such as limiting exposure to cat litter that can cause toxoplasmosis during pregnancy, helps reduce retardation that results from this infection.