I have a seven week old Speckled Sussex, who is probably a cockerel, who has much larger comb and wattles than yours. Although I am pretty sure mine is a boy, I will keep hoping until the little one crows. It doesn't look like yours has any skinny feathers yet, so that is a good sign if you want a girl. I would remain hopeful if I were you. I have seen posts where 100% said birds were a boy and with later update, all were wrong. "You never know until it crows."