We have big headed people in our family as well. Dd10, when she was a baby and they were still measuring heads at check-ups, had a weight and length in the 5th-15th percentile and a head in the 95th+. Turtlenecks never fit over their big heads either. I'm left pulling and pulling while they scream as it's stuck around their brow area. It is getting better as dd12 now fits into juniors clothes.