Nipping, biting and chewing are normal behaviours for puppies of any breed of dog. Yet while it is pretty harmless in a young dog, it could be outright dangerous if it does not learn not to bite before it reaches adulthood. Granted, it is without a doubt still meant to be playful, but as it is difficult for dogs to gauge the limits of human pain thresholds or tenderness such habits in fully grown animals could easily lead to serious injury to someone of the family. It is therefore important to early on teach the puppy to stop biting. 

Note that the rules of puppy training in general also apply to teaching your puppy not to bite. A happy, well-exercised and well cared for dog will not bite without good reason. Better yet is if the puppy has plenty of chewing toys to play with, as in being designed to be chewy the dog will in all likelihood prefer them to the hands of its owners. Moreover make sure everyone in the family avoids playing rough games with the dog, as it could cause aggressive behaviour of all kinds. Training might be necessary in spite of strict adherence t these points and should, if so, preferably start as early as when the puppy is six months old. Be patient and expect the animal to need a lot of repetition, most likely in different contexts. Refrain from physical punishment if the puppy makes mistakes, as the long-term effects of doing so is detrimental to general obedience of the animal. 

Having noted these basic dog training facts, start out with helping the puppy to realize that biting hurts you. A sharp exclamation whenever the dog bites will suffice, as that would be how another dog would communicate pain during play. In all likelihood your puppy will understand that he has been too rough and adjust accordingly. However avoid jerking away from the dog, as that might excite it even more. Move away slowly and hand the puppy a toy it may safely chew on instead. Repeat the procedure if he bites you a second time within a short period of the first, but leave the room instead of giving him a toy. In losing its playmate and, by extension, fun and play time, the dog will come to associate biting with something negative. 

Employ this approach every time you catch your puppy biting someone, however harmless its intentions. Also encourage other people that have regular contact with the animal to do the same. While in the beginning you may want to let soft or shallow nips pass, you should gradually expand your reaction over time until it encompasses any instance of the puppy putting his teeth to you. On the other hand you should remember to give plenty of praise for good behaviour so as to reinforce it.