My son is one, and has had some sensory issues since birth (he had torticollis and his PT noticed this...). That coupled with the fact that he's not slightly reserved (compared to his twin sister) and a family history of ASD (my nephew has asperger's) has always made me hyperaware of ASD signs.
He's 12.5 months, 11.5 adjusted, and he's not gesturing yet at all. No pointing, no waving. He'll engage you, and he'll play hide and seek with his sister under the cribs and yuk it up, and play chase with me and his dad, but he won't initiate peek-a-boo (though he thinks it's funny if you do it), and he won't hand you something if you ask him to. But, he says "No", "agua" (spanish for water -- nanny speaks only spanish), and "dada". So, he's responsive, and enjoys being around people, but he doesn't really seek interaction all that often.
Am I being hypersensitive because I'm too familiar with ASD in my own family? He's always hit his gross-motor milestones slightly late, too -- sitting alone at 7 months, pulling up at 9.5 months, etc... Does this raise any red flags to you guys, or should I just wait it out a bit and see if he catches up?