First of all , that sounds adorable ! :) iLovee peoplee who also likee pits .. Which is not many anymoree beecaausee if whaat peoplee saay about them .. && youuh should take 'em to the vet just to makee suree thaat they're alright ! :D
As a Vet I will say this... I agree the puppy might be teething, puppies of any breed go through this stage... However, try filling an empty soda can with pennies and when you catch him /her in the act, jingle it... Usually scares them into stopping! Another trick is to get a spray bottle and fill it with water and a teaspoon or so of cayenne pepper! Absolutely NO physical retaliation from humans though! I find pits to be wonderful, loyal and loving dogs given what all God's creatures should have... LOVE!