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Sports concussions (football, soccer, ice hockey, etc.) - What's the evidence, in your view, of concussions / sports concussions being a cause for some cases of autism? Asperger's? ADHD?
Nope. They can cause traumatic brain injuries, though.
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Also, shaken baby syndrome / non-standard birth process/delayed birth process - complications/delivery by forceps, attention deficit(s), etc.
Has been connected to cerebral palsy, but never to autism. Most CP is already there at birth, but complications and very early brain injuries account for some of it.
Autistic babies are more likely to have been premature; but this is also true of other developmental disabilities. Most likely, the cause-and-effect is the other way around: The birth was premature because the baby is autistic.