
I have 13 Barnevelders due to hatch next weekend, and I was wondering if you can sex them based on the color of the feathers on their breasts. In the book "Choosing and Keeping Chickens" by Chris Graham, he writes about Barnevelders, "...any day-old Double-Laced male will be easy to identify from their white breasts; the females are gray-brown there."
Is this an accurate method of sexing the chicks? I have tried to find other sources to confirm/deny that information, but I've come up with a big goose egg

Thank you for your help.