I think that I agree with passthepotatoes to some extent.
But reading your two most recent posts has possibly given me some insight into DD#2, the almost 5yr old who is off to the psychologist about not talking to adults she doesn't know well next week. I have wondered if she stopped talking to other adults because someone reacted badly when she was a talking 10 month old, but having been unable remember anything like that I had dismissed that theory. Perhaps giving up on trying to talk to people who wouldn't listen or underestimated her was part of where this habit formed. Her diction was always pretty amazing for her age, it actually got worse as she started mumbling as one of her many speech avoidance strategies. Retrospectively my DD would have qualified for a selective mutisim diagnosis 18 months to 3.5 years and has slowly come out it enough that now we have been directed to a generalist clinical psychologist instead of a selective mutisim specialist. We'll see what the psych says about her on Tuesday.
I think my advice would be don't worry too much, but do keep an eye (ear) out for selective mutisim developing. A child that won't talk can be a real problem.
