Perhaps the single biggest question among parents concerned about autism is what causes the developmental disorder, which now affects one in 88 children  in the U.S.
A preliminary new study published Monday in the journal Pediatrics  found that if a woman has the flu or a prolonged fever during her pregnancy, her child may be at increased risk for autism spectrum disorders. Researchers analyzed data from nearly 97,000 children born in Denmark between 1997 and 2003 and their mothers' reports on any infections they had while they were pregnant as well as whether they had taken antibiotics.
Autism Linked to Fever & Flu During Pregnancy, Study Finds- http://www.huffingtonpost.com/2012/11/12/autism-pregnancy-fever-flu_n_2103386.html?ncid=edlinkusaolp00000009 
Interesting theory! What do you think about it? Do you plan to get the flu shot during while you are pregnant?