Is there any way to tell the sex on 3 day old barred rock chicks? I thought i read somehwere on here that you could tell by the size of the white spot on their heads? I got 9 of these lil spitfires as packing peanuts in my order from ideal, My hubby is really digging them and wants to keep any possible hens. Not all look the same, some have bigger white spots on their heads and some have more white chests.