I have two children. Although the younger has not been tested yet, it appears his IQ is probably higher. He was much less impressive with early milestones, though still noticeably ahead. His sister, on the other hand, was freakishly early with language and also knew and memorized all kinds of things very early (alphabet at 16 months, etc) with little to no effort on our parts. She is still an incredible memorizer; she would probably do very well in medical school.