My gorgeous ds is 18 months old and doesn't utter one word that we can recognise. He understands a lot, for example I can say lets put your shoes on and he gets his shoes. He also points and makes it very clear as to what he wants, and is very engaging - lots of waves, massive smiles and generally a lot of fun! But no words!!! He is my 3rd dc and I know my other 2 were saying a few things by now. Do you think it's time I asked the hv to refer him or wait a little longer?