I'm not seeing anything indicating cockerel yet, but only time will tell for sure.
It's still too early to know for sure. Pea combs take longer to develop.
Sumatras seem to be feisty in nature....however, some are also affectionate. Mine is both.
~Alex
Yay! That makes me feel sooo good!Pullet! I know one when I see one
Really? They look so huge to me! Haha. But I only have my silkie Fifi to compare Birdie to and Fifi is 2 weeks younger and her feet are covered in fluff!
I'm pretty sure red combs and faces are correct for splash variety Sumatras.Her comb does seem to be getting a little more pink. I’m not sure if that means anything with this breed since they’re not supposed to have a red comb anyways!
When I first got birdie, she was an only bird child. Naturally very noisy from being lonely but even more so if someone wasn’t holding her. But then I got her a mirror
She did go through a period of being scared of the world. Now she’s not nearly as flighty. She’s super nosey, curious, and will chance any stick or branch you move around. Kind of another reason I was like omg I hope you’re not a roo. She seems very confident for a pullet! And she’s much more independent than the silkie. In fact the silkie loves her so much, maybe even thinks birdie is her mom even though they’re only 2 weeks apart. The silkie cries for her if they’re separated but Birdie doesn’t care much if the silkie is not around. She pecks away and keeps it moving. She’s a very odd but silly birdie!
It's the black that sport dark features. Hopefully the pink you're seeing comes and goes, which would probably be caused by momentary excitement? 
If it were here to stay, I'd be a little more suspicious. Not sure if that's typical for the breed, but my experience has been very similar. Bet you love her to pieces. 
Hopefully the rejected Silkie will eventually get the attention it deserves. 
I'm pretty sure red combs and faces are correct for splash variety Sumatras.
Birdie sounds like a real stinker, not to mention full of personality!
~Alex
