Difficult to sex Legbars as they grew (with photos)

I work with Cream Legbars. In the spring of 2015, there were two chicks that hatched which were difficult to autosex. So, I took pictures as they grew. Here's what I found: both chicks were female. I've found that eye-liner was an accurate way to sex these two difficult to sex chicks. If relying on eye-liner alone, I would have said female, but the tops of their heads confused me.

Chick 1

One week old:







Two weeks old:






Three weeks old:






Five weeks old:






Chick 2:

One week old:






Two weeks old:






Three weeks old:






Five weeks old: