Actually, I have heard of a connection of birth problems and those on the autism spectrum. I can't verify it (don't have statistics to back it up), but I thought there was a thread on WrongPlanet about this issue in the past, and many people said that they had experienced problems in birthing their children.
Personally, all my children were c-sections. The first was because of lack of dilating -- and he is my son that would have been on the spectrum as a child, but would no longer be considered on the spectrum now (there weren't too many doctors diagnosing for Asperger's syndrome back then). I wasn't scheduled to have a c-section for my second child, but asked for it because of potential placenta previa problems. No problems with this c-section, and child was NOT on the spectrum. Then, with the third child, I had another planned C-section because my son was large (10 lbs.) and as they gave me pitocin I began to go into anaphylactic shock and the baby had to be removed very quickly. This is my son who has had more problems associated with being on the spectrum.