If they hatched April 1st they're 11 weeks. Regardless, I see sex feathering come in for the most part around 10-12 weeks. I currently have ten week olds and my cockerels are getting sex specific feathering. My Schijndelaar has pointed saddles right now and my Black Copper Marans had them a week ago meaning they appeared at nine weeks
In fact, I have a picture of them emerging on one of my boys on June 10th meaning he wasn't even nine weeks old yet.
