Need help with chick gender- Americana, Barnevelder and buff brahma

[Bwies]

Wondering the sex of these chicks! I'm suspecting A, C and D are all cockerels and B pullet. Thank you in advance
A- Americana- 4 weeks
B and C - Barnevelder - 4 weeks old
D- Buff Brahma- 5 weeks old

 

[nuthatched]

I don't see anything that screams cockerel

 

[HorseGirlAbby]

The Brahma and Ameraucana have awfully large combs for so young, but it’s a bit too early to tell for sure.

 

[Bwies]

The Brahma and Ameraucana have awfully large combs for so young, but it’s a bit too early to tell for sure.

I’m pretty sure I heard some squawks out of the Brahma and the Americana is constantly chasing and being aggressive with the Brahma. . I only suspect the barnevelder because the 2 look quite different, the tail feathers are quite a bit longer on the suspected and has a slightly larger comb.