Signs of autism??

My baby boy is eight and a half months old and within the last week he has started not responding to his name and performing continual hand movements when he is sitting. He isn't babbling very much anymore, his eye contact and smiling at us I feel is reduced also. He has just had two teeth come through and is disrupted with sleeping in both naps and bedtime. He used to sleep through but is now up about twice night and naps are shorter. I have a family history of sutism and I am really worried. Any advice welcome.