J.F.
I wouldn't worry at all about the swaddling. I know a little girl who loved it until she was over a year old and she is completely typical now at over 2 years old. It's a comfort thing for the kid.
I have a master's in early childhood special education and I can tell you that the main things to pay attention to in young children with regards to autism is eye contact, responding to his name (by his first birthday), and being interested in and responding to other people. Plus autism isn't usually diagnosed until at least 1.5 years old, and more common when they are too, so it's a little early to tell. Share you concern with your pediatrician at your 9 or 12 month appt so that they can be on the lookout for other possible signs just in case.