We once did a totally unscientific survey of early head control here on the forum, and anecdotally, it seemed to be a good predictor of HG+ness. Many of us thought it was weird that our kids had early head control, but we'd never put that together with the GTness until so many other people here had seen it in their GT kids, too.
I'd love to see a study on it. I suspect there's some correlation.
I'd like to read that thread. Can you find it? I did a couple searches and came up empty.
I don't really know what "early head control" means. All my kids could hold their heads up quite well by 2 months, measured by being able to face outward in the Baby Bjorn carrier by that age. I have no idea if this is early, but I always turned them outward as early as possible so they could see the world. The eldest and youngest looked and looked at everything. DS7 studied at the face of whoever was carrying him --- for so long (many minutes; can't remember exactly) that I used to worry he'd strain his neck. People used to comment on it.
They could all follow an object for 180 degrees from a very early age, but I can't remember how early. DS9 (eldest) just did it the first time I tried it. I don't know how old he was; I was reading ahead in the "What to Expect" book.
Is this what you meant, Kriston?
Val