I seem to remember a while ago that I read (maybe on MN) about there being a link between Augmentin (antibiotic) and autism.
My DS2 suffers from really bad ear infections - the latest one resulting in a wet ear. The ENT Surgeon drained his ears (he has grommets) but said if the AB eardrops don't work within a week she wants him to have a course of Augmentin (this was after I refused them based on my memory of this link with autism).
DS2 is 16 months btw.