20 inches tall? Almost 2 years old?
A quick browse of the internet shows that the typical 2 year old is over 30 inches long.
Why is a 20 inch almost 2 year old a big deal?
Not that I would know anything about large craniums...
I think they were talking about the head alone, however it is measured, perhaps from the chin to the top of the head...
But the strangest feature is that the skull is 20 inches long, which is larger than normal adult skulls.
20 inches is a typical length for newborns so I certainly concur with your thought.