My most recent Roo I got as a sexed silver laced wyandotte pullet. I started having my suspicions at about 6-8 weeks, but kept holding out hope before I gave him away since he was so pretty.  His legs didn't get thick until he was about 3 months or so, but by 14 weeks he was getting the pointy little tail feathers so I had to give him away 
	
		
			
		
		
	
				
			
 
	 
 
		 
 
		 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		