2.5 year old small head

Elizabeth

I have never really been concerned because my son is very smart. He’s learning at a 3.5-4 year old level. He’s very intelligent but today I can’t quit staring at his small head. Does anyone else have a child with a small head or did it finally get bigger?? I also will say he was preemie and only 5lbs at birth and his dad has a small stature!