Hi. I've read that it's very difficult to guess the gender early on, but I'm dying to know. My white crested black polish has the largest crest and is starting to develop longer thin feathers out of her longer tail feathers. My golden laced polish is taking her time growing her crest in and I have a houdan who seems like she is going to be a runt. They are all the same age, about 4 1/2 weeks old. Any thoughts?