3 week olds, sex and breed?

[Kbro5]

Hi there, have 3 chicks, bigger one (first photo) is supposed to be a Rhode Island Red but she is quite dark, other then her rusty head. the other 2 unsexed and from a mixed bunch. Potentials are welsummer Cross, SLW or Australorpe, any ideas?

 

[JedJackson]

Did these come from a hatchery or backyard breeder?

I think the black with orange head could be a black sex link pullet or mix of that variety.

The black and white looks like a silver laced Wyandotte or mix of that breed.

The chipmunk colored on is probably some type of Easter egger.

They are too young to sex.

 

[Kbro5]

Thanks for that, the bigger one came from the show. But other 2 from backyard breeder yes. What’s an approx age for sexing mixed breeds and what do I start to look for mostly? @JedJackson