Classroom chicks... anyone know what breed?

At the end of the school year my 8 year old son and his class got to incubate and hatch some eggs. Since we had decided to embark on our chicken journey this year and built a coop with more room than just for the six chickens we bought this spring, he was able to bring 2 home. The chicks are 5 weeks old and here are a few pictures. I'm guessing they are too young yet to tell what gender they are, but I would appreciate any input on the breed

This is the one my son calls "brownie."

This is "Yoga", because of all the crazy stretches it does.


These are just some pics of our other girls. They are about 15 weeks, and we can't wait for eggs! We have 3 red sex-linked and the 3 white are various: My son believes at least 2 are rocks, but our third one has some brown in her wings, so I'm thinking she might be a mix.

 

Thanks for the info! We pretty much figured they are a hodge podge, but I figured it didn't hurt to ask

My husband was thinking yoga was a roo, I guess I was a non-believer as the bird is very calm and quiet.

As for brownie, we get to wait and see!!! Brownie right now is very active, noisy, and almost seems to be nervous. The bird also has thick legs and large feet, larger than the other "yoga". I also read somewhere that a rooster's feathers are slower to come in. I noticed the other day when we had them outside that under the wings is just light fluff none of the main feather as you see on the back. So, not sure if this lends itself to being more towards the roo side (one with small comb) or just what the bird is.

Again, this is our first summer with chickens, it's an adventure everyday!!!