Really, I figured it would have been a couple weeks before this thing came up, but here it is, right on the very same day, and there's already enough complaints about the 3DS to bring about a formal statement. Or, rather, the 3D of it giving them headaches. The machine, as far as I know, is just fine. I'd never really even thought about it, but I guess this is a real thing, happening to real people. And big enough of a deal that there's actually parental controls in place that you should set up if you're giving the handheld to someone younger than 6. (Protip: Don't do that, regardless.)
I guess they just don't want this to happen.