Thank you for updating! He was a cute chick, and has grown into a handsome cockerel!
I think his mother must be one of the Barred Rock hens, and of course the Buff Orpington rooster is his father.
The Barred Rock gave the black with white barring, and also the Silver gene (turns gold into...
I don't know about the gender.
If it starts growing gold feathers around the head and breast, that would mean female (gold/silver sexlink.) I don't think the color of the chick down can tell us anything about the gender, because it is probably just black down turned white by the Dominant White...
I think it is a cross of Buff Orpington and Barred Rock.
The Barred Rock gives the genes to make a chick black all over.
Some Buff Orpingtons have a gene that turns all black into white.
Result: mostly-white chick.
As it grows up, it will probably be mostly white but have a few black dots here...