if it has an eyeliner, its a girl. If none or faded, its a boy.
On top of heads, a real defined stripes, its a girl, if faded, its a boy.
I see maybe 4-5 girls and rest of them are boys.
In some certain bloodlines, the sex can be told right then and there while others do not. So it is not 100% fool proof method. I think pure Lowell Barber lines are the ones you can tell right off when they get dried off.