I have 13 week old polish and so I'm a little new to the polish world but as of right now that hair is looking nice and "contained" like a pullet. My polish roos have some WILD hair.
edited to add... from the angle your pics are at the saddle feathers also look very rounded still.
I would say pullet. My cockerels took a lot longer then 6 weeks to have a full crest like that and the cockerels have a crazy crest compared to the pullet puff ball which yours seems to have.