Help me guess our Mystery Chicken breed?

[Joshua G]

 

[Joshua G]

I had the same thing happen. No idea what this one could be it has to be at least 2 weeks old and the one behind it is at least a week younger. She is so small

The smaller one looks like a Silver Sebright, which would explain the size difference.
The black one looks like a Barred Rock.

 

[SizzleQueen]

I hope someone can help me guess these three little hens i have raised. Tractor supply had them all in throw away ben pretty much. The little black one has feathers going down her legs just so everyone knows!