gender polish 5 weeks

Hi all! Long time lurker, first time poster! We are experienced chicken folk but are new to bantams. I picked up these two cuties when they were about one week old. I think they are almost a month now. I believe one may be some sort of Polish Crested and I think it's a roo but would love any...

Hi everyone. I know it's a bit early, but any guesses on gender for my white crested polish baby? My Silkie has been raising it so I have no other siblings for comparison.