How many words does he have? In the book I have here, by 18 months they "should" have around 3 words that are pretty clear.

I can't remember how many Kelti had at that age, but she's just had a word explosion, so is saying heaps more now - so from 19 months to nearly 2 - its incredible how much they pick up.

Really, there isn't much more you can do - just talk to them and read books, and you're doing a damn fine job!

Stress less