This BR has me stumped!

[Happy Chooks]

Boy.

 

[speckledhen]

This is a 12 week old cockerel-colored pullet. See her comb? Almost non-existent. She fooled lots of people into thinking I had a boy, then we realized her comb wasn't growing.

Here is her own son at 12 weeks old. See the difference? And he was slow to grow his comb, too, like yours: