Since Orpingtons are slow feathering- both pullets and cockerels will feather at the same rate. If an Orpington was crossed with a fast feathering breed- it could be helpful- but the chick in question looks like a purebred.
So comb/wattle seem like the best bet for the next couple of weeks until sex-specific feathers emerge after 8+ weeks.
So comb/wattle seem like the best bet for the next couple of weeks until sex-specific feathers emerge after 8+ weeks.