This method is 50% accurate. You have same odd as if you just guessed. It is an old wives tale. The only 100% accurate way to sex them is crow/egg, otherwise it is a guess, sometimes with lots of experience you can more accurately guess at 4-6mo. I am training myself at vent sexing 1 mo LF chicks, so far I am at about 80%. Hoping to be able to do it on the Silkies and other bantams I have.How soon can you tell from a picture the sex of a silkie? I got this one a couple weeks ago and it should almost 3 weeks old. The seller told me she was pretty sure it was a rooster. When I asked her how she could tell she held him over on his back, he pushed his feet out away from his body. She then picked up a bird she had told me was a hen and when she did the same it pulled it's feet in close to it's body. She said a rooster will push his feet out and a hen will pull them in. Ok??
This little baby does have only 1 long fuzzy piece that sticks out on the back of this head. But he does seem to act like a rooster.