Apparently I am an idiot :(

[inchworm]

I bought my 4 wyandotte chicks all at the same time. One always had a bigger and redder comb. Someone else with more chicken experience tried to tell me she was a roo. I held onto her and she is indeed a she and her comb now looks like everyone else's. Maybe she is just an early bloomer.

Inchy

 

[kyrochka]

He/she looks like a hen to me. One of my hens has a red comb. She is a leader of the pack, lays eggs and doesn't crow.