Usually but I believe a few people have ended up with pullets with 3 rows. Feathers can tell too. Females will have a even coloring and boys are flashy.
I had to go out and double check mine. And I have 3 rows on my pullets. sometimes doesn't show up when young and then show more at 3-4 months old. So I don't see that as a good way to sex the chicks.