Infantile spasms and autism related?

Not always: Infantile spasms are a specific form of seizure seen in infants that will generally be replaced by other seizures as they get older. Though children with autism are more likely to suffer from seizures, not all of them do.

West Syndrome: Any brain pathology causes greater risk of autism. Underlying causes are found in > 75% of infants with west syndrome. Almost 50% of infants with ws have a prenatal cause like abnormal development of the cortex of the brain, metabolic syndromes, or genetic syndromes. Tuberous sclerosis can cause both west syndrome & autism. West syndrome itself can cause regression or arrest of development.