What's up with all these tiny, skinny kids with giant heads, lol?
Both my kids have big noggins, especially in proportion to the rest of them - DD wasn't on a growth chart for weight from 6mo-4 years old, but was like 85% for head... DS was in the 5-15% for weight I think, and off the charts for giant head.
I keep saying that I'm going to try and weigh DD's head, because it's so HEAVY compared to the rest of her. I always have to buy her big hats (size 8+ at Gymboree, her new Sunday Afternoons sun hat is a "youth" size and fits WELL for this year).
Her BFF is tiny (I would say MAYBE 41" at 6 yo? and around 35lbs his mom says) and has a HUGE noggin.
I don't have any data to back it up (or maybe I could find something European, if I felt like hunting right now), but it makes logical sense that head excursion would be higher in a HWHing situation, if the head is that much heavier and is moving forward at a high rate of speed (but we're getting into shield booster versus harness seat I feel like, maybe). HOWEVER, that doesn't mean anything - sometimes crash dynamics are different than straight physics on paper, you know?
It's interesting, and REALLY makes me want to take a summer course or something at the local college.