Posted here, obviously, for traffic volume.
DS1 was diagnosed ASD a few months ago, aged 3.4. He was an exceedingly difficult baby, refluxy, overwhelmed to the point of screaming when faced with many different stimuli, he pointed very late, had a half-bum shuffle instead of crawling, had to be rocked vigorously under a muslin blanket to fall asleep etc. etc. The ASD is mild, in that his language and comprehension skills are normal/above normal, he's very affectionate with me and DH, but he has zero social skills with other kids, has lots of repetitive and stereotype behaviours etc. and his rigidity and meltdowns can be epic.
DS2 is 13 months. He has been a very easy baby. He laughed, smiled, rolled over etc. right on time, but over the last couple of months, my mind has started to drift to ASD. (I guessed ASD for DS1 at four months, crazy as that might sound.) His eye contact has become very fleeting, he enjoys looking at my mouth move rather than into my eyes, he doesn't walk, clap, point, say mama or dada, doesn't lift his arms to be picked up, and though he babbles somewhat (and I believe he babbled more at 10-11 months), his predominant noise is a rather monotonous and frequent "uuuuuurrrghh". He does seek me out and make that noise to be picked up, he sometimes but often while looking away, and he loves instigating peek a boo with the curtain, but there's a nagging feeling that something is not quite right. The lack of gestures is the thing that concerns me most.
We are in the US, so I can seek out a developmental pediatric opinion with a fairly short wait time, but I'm wondering, do I take a wait-and-see approach for, say, six more months, or get on it ASAP.