I need some pointers of how to tell if my Silkies are pullets or roos! 4-5 weeks old and I have no c

[aimplus4]

I have 2 of them and they look exactly the same except one is larger than the other. I named them Fluff and Puff. Here is Fluff and this is the smaller one....... Are their any differences? Will the male's comb get bigger faster then a females? I know I have so many questions... lol Thank you in advance for any info on this matter

 

[Lothiriel]

The one thing I can tell you for sure: 4-5 weeks is WAY too early to guess on Silkies. Usually 3 months is the soonest you can be accurate, unless a cockerel crows sooner.
Hope you do have pullets though!