Here's some pictures I posted of my Wyandottes when I was trying to figure out "he or she".
The GLW and one SLW started pinking in the comb at TWO WEEKS!
The SLW really threw me for a loop when she all of a sudden started sprouting a long tail feather!
Her tail is normal now, I think the long one fell out. I think she was 11 weeks old here.
Here she is at 5 1/2 weeks.
My Wyandottes were BY FAR the hardest of my pullets to sex. I didn't feel I knew FOR SURE what they were until they were practically grown! I assure you they are all pullets, I have been in the coop when many of their eggs are laid.