Is a term that
was once used to describe someone who learns and develops more slowly
than other kids.
Today it indicates subnormal intellectual development as a result
of congenital causes, brain injury, or disease.
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FRAXA
Research Foundation - Fragile X is the most common inherited
cause of intellectual disabilities and the most common known genetic
cause of autism.. 3/5
Family
Village - Information, resources, and communication opportunities
for persons with mental retardation, & other disabilities, for
their families, and for service providers. 3/5
Wiki
Fragile X Syndrome.- Fragile X syndrome (FXS), or Martin–Bell
syndrome, is a genetic syndrome which results in a spectrum of characteristic
physical and intellectual limitations and emotional and behavioral
features which range from severe to mild in manifestation.
3/5
Google
Scholarly Articles on Mental Retardation - Click
Here
Mental Retardation 
