What can i expect with pyelonephritis during birth?

Depends: Hopefully you mean you had pyelonephritis earlier in pregnancy. If so, it should have no impact at all during delivery. It is a kidney infection treated with antibiotics. Once it has resolved then no special treatments or precautions need to be done during the actual delivery. If you are in labor now with a current kidney infection then antibiotics will need to be continued.

Antibiotic treatment: Your infection will be treated with antibiotics and your baby will be observed for signs of infection.