I go by legs alone. I keep track in 3 categories. Dark legs, Light legs and what the heck is this? lol I get about even dark and light and there are these chicks that can't be categorized. The dark legs are always girls. The middle (?) group is either gender and the light is typically boys. I don't usually get girls with light legs, but it has happened. Once they have their wing feathers in it's pretty easy to tell. Here is a recent example. I've raised so many Barred Plymouth Rocks this year that I have become very good at knowing by 2 weeks. I never pay attention to the dot. It does not work for me! As you can even see in this picture. Girls are supposed to have defined dots.. but in this picture the male has the defined spot. The down colour is also identical. The only difference I can clearly see at hatch are the legs. Just for fun, here is a mom.