I don't see any Cochins in there. They have feathered legs. And a Isa Brown is a sexlink, so males and females are different colors and they are sexable at hatch. The red ones don't look like Isa Browns, either--they seem too dark.
OK...sorry for the confusion...There are 2 chicks...top two pics are Meme----She / he was layed by a Black Cochin.....who has feathers on her feet.
last 2 photos are Uno----She / he was layed by an Isa Brown.....so, Now I am the one confused. The Hens that layed the eggs they came from are mine...?
1st one looks like a girl. Definately not a cochin. All the cochin crosses I have hatched have lots more feathers on the legs.
2nd one is a roo. See how thick the legs are? Do you have an Easter Egger rooster?
Red sex links, at hatch, are different colors. The girls are red, the boys are white. BUT- if a sex-link hen has chicks- they will NOT be sex-linked. It only works on the first crossing- like a RIR roo x White Rock hen= red sex- link chicks.