Flat head = possible rooster?

[Woodlit]

Last wednesday I picked up my chicks from the post office. 2 Leghorns, 2 RIR's, 2 orpingtons, and 2 wyandottes. I've noticed that the orpingtons both have a flatter head than the rest of the chicks. One has a much higher crown than the other, but both show this trait. I'm wondering if this is just a trait of the particular breed, or perhaps maybe this is a possiblilty of a young rooster. I had them sexed for females, but I know there is always the possibility of getting a rooster in the mix. Any thoughts?
Thanks!
-Woodlit

 

[Woodlit]

Just in case anybody read this a couple of months ago and was wondering just as I was...
Yes, the flat headed baby chick turned out to be a rooster. It was pretty obvious a couple of weeks later, but now at just over 14 weeks old its hard to miss
Its funny listening to him trying to compete with the neighbor's rooster. He as the melody, but his tone and volume aren't there yet hehe

Sorry about the bad pic quality

 

[GAchick]

Well, he's a handsome fellow!

 

[chixie]

your rooster is pretty