Gender of these chicks?

[ChickyChickyChick]

These guys are 4 weeks old Thursday, is that old enough to tell their genders? Also sorry for the bad pics, wiggly chicks are hard to keep still.

 

[Crazy for Chickens!]

Too young. Post pics of their combs at 6 weeks.

 

[HuffleClaw]

x2

 

[crazy4ChickensNducks]

They are a little to young, but if I were to make a guess no.6 looks like a cockerel