SNG's Mummy
I think your son better. Mine only talks to selected people, he's especially interested in pretty girls. I think cos he speaks well in English but Mandarin not so good so to the Aunties he just stare at them when they speak to him in Mandarin. Next year he will go to totally Mandarin nursery so I think by then all the Aunties in the block will know him and can talk to him already!
In the car mine also the same. Ask him 5 min keep quiet can or not. He'll say can then keep talking still. Not only that, he will give his daddy instructions on how to drive! Slow down, don't put your signal, switch on your wipers etc.! His Daddy also headache.
pmm
My SIL son had the same problem, he had a push walker and didn't know how to use it and lacks confidence. When he came over, my #2 was happily pushing it around then within a week, this little boy also started walking already!