I honestly won't ever trust sexing silkie method unless it's professional vent sexing when they are day olds.24 weeks!? Wow. I knew it took awhile for this breed but dang. From what I was reading online there were ways to tell when they were 11 weeks. But also that they were hard to sex. Very conflicting. But I’m fine waiting for them to mature. I just hope some are girls. I haven’t had the best luck hatching out girls.