ee gender

So I got these chickens at our feed store, June 7th and they were 4-5 days old. So I'm guessing they are about a month old... The more white one is birdie and then there's sparkles. I think sparkles is a roo... About 4-5 days ago the red popped up, birdies is reddish but not like sparkles, now I...

I have 9 chicks in one of my coops. I know 7 are cockrells (very red, very developed combs and wattles, sparring) and 1 is a pullet. I believe this one is a pullet as well based on less comb and on behavior. She is 9 weeks old. I am mostly concerned about the coloring...all that red! I'd love...