How to tell if a chicken is a cockerel/hen

[ChickenXCX]

I've got 9 bantam chicks they hatched about 2 weeks ago now and most is getting feathers already and a little comb does that mean there cockerals only about 3 has got feathers and little combs but others don't. Will get pictures later on

 

[crazy4ChickensNducks]

It could be they are cockerels, but it is best to wait at least 6 weeks to know for sure.