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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.
There are many causes of intellectual disability, but doctors find a specific reason in only 25% of cases. Risk factors are related to the causes. Causes of intellectual disability can include: 1  Infections (present at birth or occurring after birth). 2  Chromosomal abnormalities (such as Down syndrome).