my son is almost 18 months old now and he has a rather large head. when he was born it was in the 25% then seemed to get larger with each visit (37%, 38%, 68%, 78%, 81%, 70% and his 1 year visit he was 95% in head circumference). Our pediatrician said he wasn't concerned but I must say I'm a little paranoid about it. I have a 3 year old son who has always had a head circumference around average. Should I seek a 2nd opinion or is this normal and am I just being overly cautious?