I've recently noticed my DS (age 3 and a half) makes some funny finger movements, usually just when walking/standing around waiting. He seems to hold the tip of his index finger or sometimes middle finger and thumb together, sort of like an "ok" sign, or as if he's making shadow puppets. Occasionally he also uses the middle finger to pull the top of the index finger back, as if he's stretching it. Sorry it's really hard to explain, I don't have a photo but will try and take one tomorrow to include.
My first thought was finger posturing, which I didn't even know was a concern relating to autism until recently!
Does anyone else's child do this? My DH also fiddles with his fingers a lot, slightly differently. He's not autistic. But I do have some (minor ish, mostly) concerns about DS and autism. We are waiting to see a community paed, but that won't be until middle of next year.