Three week old comet, hen or roo?
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If it is definitely a comet it is a pullet as they feather in brown with white and cockerels feather in white with small areas of red (wingbows, etc) that is the beauty of comets, they are "sex linked" and can be sexed with 100% accuracy at hatch by color. That being said, this chick appears to have had awfully white down was it at all reddish over the back/body when it was still downy (this is why I said if it is a comet)?
Edited by Ol Grey Mare - 4/11/16 at 2:45pm