Interesting question, ColinsMum. Here's another anecdotal data point for you.
Both my boys were early talkers. DS6 is gifted, and while we don't really know about DS2.3 yet, we suspect he is. He didn't speak his first purposeful word until 13 months, but was using 2-word phrases at 15-16 months, and 6 months after that was rattling off 7-10 word sentences. When you ask him something, he answers in full sentences rather than one-word responses (e.g. "Who wants to go to the park?" ...answers "I want to go!" rather than "Me!")
How does that compare to "normal," or to other gifties here?
