According to my mother, I had very early milestones. I am HG+ (or was--middle age seems to be taking its toll).

My older son was average with regard to milestones except for speech. He didn't start talking well until he was 3 or so. He has dyslexia and a slew of other diagnoses and is HGish.

The younger one was fairly typical except for speech, where he was somewhat early (10 months with solid sentences at one year). He is HG+.