Help me find this child's mother

[Jax-stcroix]

Good evening and merry Xmas to all my chicken friends. I'm hoping to figure out what this BYM chick may be. The only rooster I have is a Golden Comet/Red Sex Link. The possible hens would be White Rock, Speckled Sussex, Welsummer, Brown Leghorn, or Production Red. Unfortunately, I didnt see this one hatch, im sure egg color whould have helped narrow it down. What do you think? Im leaning towards Welsummer or BL???

 

[BobStuart]

white rock i think

 

[JedJackson]

Welsummer or brown leghorn is my bet. The chipmunk pattern is present on the back of the head but nowhere else, and that is because the father has the dominant white gene that blocks most black coloring and changes it to white. Sussex have the chipmunk pattern, too, but I would expect the chick to have white legs, not yellow, if the Sussex was the mother since white skin is dominant over yellow skin in chickens.