Cant help you with ID, but it is a beautiful lil chick.

I do have a question about how you are housing your 4 chicks, and their age in weeks. Do you have a heated brooder???
You don't have your location in your profile, so I have no idea, of temperatures, in your area, as well as affected temperatures inside your home.
The warm water bottle is fine, but it loses its heat in not that long of time period.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
