What are some tips to sexing young light sussex chicks?

[AussieHens96]

So we're picking up some light sussex chicks next week. By then they should be between 4-7 days old. Are there any good indicators of gender? I know its hard but anything that would make a female seem more likely would be great.

 

[donrae]

Smallest, palest comb you can find, and thin legs. Don't be fooled by "friendly" chicks, those are often roosters and not "friendly" but actually aggressive.

 

[AussieHens96]

Any other tips?