Looks like a boy to me. The "whites" are not 100% sexable like the standard color legbars. I think most people have been taking guessing and then confirming them when the combs grow in 3-4 weeks. I think people who are selecting for the "whites" are getting pretty good at sexing them at hatch (probably 85% accuracy like a barred Plymouth rock). I have seen photos that show faint stripes for the girls and faint vee's on the heads of the girls. If you aren't seeing faint stripes or vee, then I am guessing this is a boy.