After reading articles about autism in various magazines and newspapers, I was also concerned when my little one didn't respond to his name at 6 months. Then I realised I was often saying his name when his attention was on something more interesting than mommy (i.e., a rolling ball or a teddy bear, etc)or when I was telling him "no". Now my little one is 20 months and is fine. I don't remember exactly when he started responding to his name but he has selective hearing (just like his dad, ha!)and will still sometimes ignore me. I wouldn't worry yet if I were you.