you've got a while now before you worry

Jaidan did baby sign and didn't really talk until he was 2.5, he had a couple of words before then but that's when it all clicked. He understood everything I was saying, so I knew it wasn't hearing or smarts. He's fine now at 6.

The 'normal' range is 6 words aside from mum and dad, that YOU can understand. Does he say anything at all?