If you want your babies ears to stand up just shave both inside and the outside of their ears and then keep them trimmed. My babies' ears go back and forth depending on the cut. When I want their ears to stand I have them shaved otherwise I just leave them alone! The previous owner of my oldest baby would shave their ears and use upholstery glue and tape on their ears from about 2 weeks old until they went to their new homes, I find this practice cruel and inhuman. When I tried this on my last liter of pups they cried and some even bleed when the tape was removed.
So if I were you I would just shave them and let nature take its course, unless of course you plan to "show your baby. Best of Luck!
Sweet Pea & Tommy's Mommy!