My friend has a son who just turned 2. He can't talk. He can repeat "hi" 1 out of 20 times we ask him to though. He is very passive ; he never makes adults around him look at him, he doesn't seem to mind if anyone picks him up, he is never fussy about anything (he just accepts everything and anything). He does understand what we ask him to do (like sit down, come over here) but only responds with a weird noise "hum". He can't point out colours or animals.
I'm worried he is either under stimulated at home or he is severely low on the IQ scale. I have tried to ask my friend about what she thinks about him not speaking but it is clearly a very sensitive subject and she just says "it will be fine". Would you be worried or have you EVER met a 2 year old like this? What do you think?