Sexing Rhode island reds

[kruss]

I have 5 chicks that are almost 2 weeks old. Is there any way to determine their sex this early? If not how long until I can get a good idea? I can takes some pictures of them if that will help

 

[gimmie birdies]

RIR males usually have a bigger brighter comb, really yellow feet and and joints that are larger at the tops of the legs. but if you lift their tail up so it opens the bung a bit, boys have what look like a dolup hanging down like a baby lip.