Help with sexing Orpington chicks.

These chicks are 5 1/2 weeks old and although I am fully aware that sexing them is difficult until later on, I thought it would be nice to have a rough idea on who's who.

My little vultures (jubilee orps)-




Emu the gold laced orp-


And my (un)buff orp, so pretty! -

I have a gut feeling that the third Jubilee may be the only girl out of this lot but am unsure as this is my first time raising chicks.