Is this normal for puppies?

We have 7 GSD puppies that are 3 weeks old. They all have 8 top teeth and 6 bottom. All research that I have done says they should start cutting teeth at 3 weeks. I am worried about them because mom has stopped feeding them. We are giving them milk replacement and they seem to be doing fine, but shouldnt their mom feed them until about 6 weeks?.....Please dont say I am just a "BYB" or that I shouldnt be breeding unless I know all the answers. If you dont want to give answer my question dont. If have something rude to say I can tell you now that I really dont care what your opinion is....everyone has to start somewhere and ask questions at some point. So please dont be rude.