I agree. My daughter turned three in June and is finally in a 3T lol. NO WAY would any three year old that I have ever seen be even close to a size six!
I am in no way comparing Caylee to this child, but I'd imagine this little one goes WELL above a size 6. I think the little girl looks older than 3, but that's what the caption says.
http://www.wftv.com/slideshow/news/2691965/detail.html
I too think 6 is pushing it, but not impossible. Especially, if you've paid a lot of money for an item and up the size for more wear, which a lot of people do when you're talking $40 to $60 bucks for a toddler's dress that isn't really, formal wear.
EDIT: I thought it would go directly to the picture, but it didn't. Go over 3 more pictures from this one.