We have a shark 🦈

Rupert, our lil (actually quite big 😂) iggy is 3 months and 3 weeks old. He is the bestest boy ever…BUT he won’t stop biting! And biting real hard. We are trying with positive reinforcement, replacing our hands with toys, getting up and leaving the room, crossing our arms so our hands aren’t out and of course saying no. Any recommendations that have worked for you guys? Occasionally he will bite down quite hard, he’s not aggressive I don’t think, but it’s more than just a playful nip. He’s doing really well with other bits of training but not sure what to do about the biting! It makes me nervous when other people play with him that he might bite too much. Any help would be appreciated!!