Cornish cross?

[Athiena14]

They don't look near heavy enough for CornishX this old. I'd say they are at least 4 weeks old, likely older.

That's why I thought leg horns.

 

[Gray Farms]

I'm leaning heavily towards Leghorn myself. To much comb and to thin legged for a White Rock this age I think. Post updated pics in couple weeks.

 

[drumstick diva]

agree with Gray Farms

 

[AmyJane725]

I had a pet cornish as a kid. Your bird isn't nearly fat/squatty enough to be a cornish. Not sure if it's a leghorn or not. There are other white birds. Just pretty sure not a cornish.