HI Julie
Pups are such fun aren't they

Having just recently gone through the excitement with a BSd pup I will try to give some ideas on how we coped/solved the problem.
A lot depends on the pup - and your children !!! <g>. Have you tried the "Ouch" routine, when the pup uses her teeth, as this may stop some very sensitive pups quite quickly. HOwever the majority of pups, ours included ,think you are a new squeaky toy when you do this and simply take it all as great fun.
So we simply ended any game and stopped all contact with her for up to 2 minutes (any more and she will forget what it's all about). By all contact i mean, eye contact, voice, reactions, everything, and if you are consistent you will win through. Start at first when she is much too rough, then graduate until she realises she cannot even very gently take your skin as you are so fragile.
Opininos vary and there are different methods, but i like this one, and it did work for us. (Although i have to say we should have been more consistent than we were!).
We also balanced this by teaching her to accept her eyes, teeth, mouth, and ears etc etc beng handled, so she knows there are occasions when it is OK for teeth and human skin to be in contact but only at human instigation.
LIndsay