Proud mom of an average child

Went to the doctor recently and my boy is average. Awesomely so, in my opinion! And I got to thinking, why do so many parents think their child is special and above average. It just isn't possible. Someone has to be average and someone has to be below average. Everytime I talk to a parent these days, it is all about how ahead they are of milestones, how they are in the 95 percentile of everything. They say it as if they got an A in weight or head size!

What is wrong with a kid hitting milestones on time? What is wrong with the 50th percentile? Maybe I am being sensitive because my son is regular!