There are no clear indications that children with food allergies, digestive issues, seizure disorders, sleep disorders, bipolar disorder, obsessive compulsive disorder, speech apraxia or sensory integration dysfunction are more likely than other children to be autistic. There is, however, a large community of people who believe that one or more of these biological issues may lie at the root of some cases of autism. Certainly it is the case that autistic people are more likely than others to have these additional physical conditions.
Some other possible risk factors for autism include:
- Advanced age of parents
- Spontaneous genetic mutations with no known cause
- Low birth weight and premature birth
Greenspan, Stanley. "The Child with Special Needs." C 1998: Perseus Books.
Romanowski, Patricia et al. "The OASIS Guide to Asperger Syndrome." C 2000: Crown Publishers, New York, NY.