How do you sex baby Wyandottes?

[ClairedeLune]

I have a flock of almost 3 month old Wyandottes from Paul's Poultry, is there a trick to sexing them or should I post pics?
Thanks!
ClairedeLune

 

[Katy]

Post some pictures. At 3 months it should be easy to tell the difference in the sexes.