When you incubate your own eggs not only can you not count your chickens before they're hatched but you can't predict how many will be hens and how many will be roosters.
Last year I just had six and for a long time I optimistically thought I had five hens and a rooster. Wishful thinking and ignorance on my part. I actually had three of each. Now that I know how to tell the difference (without waiting till they lay eggs or crow) I am interested to see how young it is possible to tell.
These chicks are one week old. Four are yellow and three are lighter with a black stripe on their heads. The black and white wing feathers are the first to develop.