Thread: Age/weight chart?

Is there any kind of Age/Weight chart out there to get a feel for how big a kitten (male or female) should be at what month? I got my girl Tiki at about 16 weeks and she was just soooooo much bigger than Parker, the little boy I just got at a little over 12 weeks. I know they were picked up about 4 weeks apart, but aren't boys bigger anyway? I'm confused.....