I’m guessing the Olive Egger could be a cockerel. I have no experience with Seramas. Rest of the birds appear to be pullets so far. SS and not EE. Beautiful birds!
Here are some updated pictures of Pepper the Olive Egger. Definitely some red in the comb, but no wattle development. She is 7 weeks and one day old today. A few of the others are getting red in their combs too, but still no wattle development. Is it common for that to occur at this age? I'm new to chickens, but from all I've read they look like pullets to me.
Here are some updated pictures of Clover the Serama. She is 5 weeks and 4 days old today.
Okay 14 week update. Everyone still looks like a pullet except my olive egger. She still has mostly pullet features, no wattle development, same size legs and feet as my other girls, no signs of crowing, and her feathering looks basically the same, no saddle feathers... but her comb is bigger. Most of my girls have red in their combs now so I'm still not sure. She was purchased as a sexed female chick from Meyer Hatchery as were the rest of her flock mates. Here are some pictures....
Keep in mind my chickens run around all day so their combs do get quite red. Especially when they run for treats haha!