As above really. DD is four months old. There is autism in DH's family, three of his siblings children have it. So for full disclosure, I'm an anxious person and it was always in my head as a possibility.
DD does smile and make eye contact, but she doesn't do it as regularly as I'd expect and often actively avoids it. She seems quite serious - someone will be playing peekaboo and there will be no reaction, or not for a long time. She doesn't babble, but she grunts, hums and blows raspberries. The odd 'ehhh" sound, but she seems to be quite a quiet baby, though she recently started squawking in excitement when we shook a maraca at her.
Rolls from side to side, but not over all the way. Always wants to be held up on her feet - goes through periods where she simply never stays still, and is wriggling, twitching and flailing for ages.
The things that really worry me- when she's feeding (breastfed) she does this really weird repetitive movement with the arm that's on the upper side. The arm basically moves in the way it does when you see someone doing a star jump-sort of straight out and up and down--and this will go on for the whole feed. She also opens and closes her hands a lot too, I've seen the children in DH family do similar and it was mentioned as a sign of autism. She does grasp things and brings them to her mouth, and she eats and sleeps well.
I know all this sounds like it could be any baby, but I have a niggling anxiety that it is something more, though I'm not sure if it's mother's instinct or if I am over anxious and feel autism is inevitable - every one of my PILS grandchildren has a diagnosis of some sort.