Expressive vs receptive: How to narrow down the gap?

[Guest guest]

Hi

My son's receptive language is progressing very well but he has not

added up to the 4 words he was able to say.

Could anybody give some piece of advice to what to do to help him to

talk. I am doing some works based on the book " More than words " with

him, but he seems has not taken off in his speaking yet. Any

suggestion?

Thanks