It is possibly autism, but I was actually thinking he might have a hearing problem? That would account for a lack of words/verbal communication. Either way, I think despite her DH's wishes to not intervene, this sounds like there really does need to be intervention because the longer it goes on, the more intensive any therapy/treatment will need to be which will be harder on the little one in the long run. I think she needs to speak to him about why he doesn't want anything done, is it fear of his son being labelled as something? or does he genuinely think there isn't a problem?