Paul and I measured Jared's head circumference yesterday and he has a big noggin. 53cm! That is in the 99th percentile! The average (50th percentile) circumference for a 3-year-old boy's head is 49.5cm. This isn't a surprise to us, though. We've known that Jared has a big head. It happens to run in the Carlson (Paul's) genes.
I think Jared's head is just so big because of the big brains and intelligence he has to carry around ;)