Autism linked to mother's antibodies
A new study of 2,700 mothers of kids with autism found that about 1 in 10 mothers have antibodies that react with the proteins in their baby's brain.
So why don't those antibodies hurt the mother's brain? Because the blood-brain barrier in the adult women prevents it. but that same filter isn't yet well developed in fetuses. So the antibodies pass through, harm the babies brain and (may) cause autism.
So obviously, that's not the cause of autism for all babies. But 10% is a pretty high percentage still.
Here's what I read: