Is my Barnevelder a cockerel?

[Peckeruk]

Hi all
What are your thoughts on my 6 week old Barnevelder, I think it is a cockerel.
The first pic is of Solo my Barnevelder which I think is a cockerel. The second pic is of his sister who hatched at the same time.

 

[sourland]

Yes, the first bird is a cockerel.

 

[chicklove14]

It is hard to tell, but maybe watch the behavior of the chicken