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Communication is one of the challenges for children with severe and multiple disabilities due to their impairments (Turnbull et al, 2004). There is about forty percent of unknown causes of severe and multiple disabilities, but prenatal biomedical is the majority known cause of the disabilities.
Genetic Causes of Intellectual Disabilities. Many intellectual disabilities (ID, formerly mental retardation) are caused by genetic abnormalities. The two most common genetic causes of intellectual disabilities are Down syndrome and Fragile X syndrome.Down syndrome (or Down's syndrome in the UK). Down syndrome is the most common genetic origin of intellectual disabilities (ID, formerly mental retardation).Down syndrome occurs in 1 out of every 800 births.Down syndrome derives its name from John Langdon Down. He was the one who first pinpointed the disorder.own syndrome (or Down's syndrome in the UK). Down syndrome is the most common genetic origin of intellectual disabilities (ID, formerly mental retardation). Down syndrome occurs in 1 out of every 800 births. Down syndrome derives its name from John Langdon Down.