I have 2 spotted sussex. Im assuming same age. They are still small but one has more feathers and some tail feathers. Does this mena one is def a boy?
Cochin development and Sussex development isn't the same. What you can look for really at that age is comb development but you can't really be sure until around 7-8 weeks sometimes longer (unless you have a crazy fast developing cockerel).
I referred to those drawings when we hatched bantam cochins - it was of no use to us. The boys feathered in faster than the girls in our case. I think certain breeders see patterns in their offspring that won't apply to someone else hatching the exact same breed from a different breeder. It's just a case of wait and see. You can post photos on this forum to see if someone can help you guess what you've got. Chicks need to be 6-8 weeks old before there are any tell tale signs that might hint at gender.
