Seen a lot of males with barely pink combs, seen a lot of girls with pretty visible combs. My boy was reasonably easy. I guessed he was male by the first week. I knew it by week two. Here he was at about 2 weeks.
His comb was pretty well developed.
When his feathering came in it was a lot easier to see he was a boy. His shoulders got a lot of white, and his pattern was a bit mashy.